Get Air conditioning system Refrigerant circuit -> 1.6 Cleaning refrigerant circuit Guide for Volkswagen Sharan VAN Second Generation (2010-2023)

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1.6

Cleaning refrigerancircui

⇒ “1.6.1 General information aboucleaning refrigerancircuit”,

page 92

⇒ “1.6.2 Preparations for cleaning refrigerancircui(flushing with

R1234yf refrigerant)”, page 94

⇒ “1.6.3 Refrigerancircuicleaning procedure”, page 96

⇒ “1.6.4 Principle circuidiagrams for cleaning (flushing circuits)

- refrigerancircuiwith expansion valve and receiver”,

page 97

⇒ “1.6.5 Principle circuidiagrams for cleaning (flushing circuits)

- refrigerancircuiwith restrictor and receiver (withouhigh-volt‐

age system)”, page 102

⇒ “1.6.6 Principle circuidiagrams for cleaning (flushing circuits)

- vehicles with high-voltage system (withouauxiliary air condi‐

tioning functions)”, page 105

⇒ “1.6.7 Principle circuidiagrams for cleaning (flushing circuits)

- vehicles with high-voltage system (with auxiliary air conditioning

functions, e.g. heapump mode)”, page 105

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

⇒ “1.6.9 General information aboublowing through with com‐

pressed air or nitrogen”, page 120

⇒ “1.6.10 Blowing through refrigerancircuiwith compressed air

or nitrogen”, page 124

1.6.1

General information aboucleaning re‐

frigerancircui

Note

♦ Work on the refrigerancircuithainvolves the air conditioner

service station can usually be carried ouwithouthe need to

de-energise the high-voltage system.

♦ Since certain components have to be removed to clean (flush)

the refrigerancircuit, the high-voltage system musbe de-

energised before work commences ⇒ Electrical system -

hybrid; Rep. gr. 93 ; Electric drive; General warning notices

for work on high-voltage system .

♦ If there is reason to believe thachemical substances (leak

stop additives) have been poured in the refrigerancircui(tha

is be flushed) to seal leaks, do noconnecyour air conditioner

service station to this refrigerancircuiand do noflush this

refrigerancircuit.

♦ Chemical substances (leak stop additives) used to seal leaks

form deposits in the refrigerancircuit. These can impair the

function of the air conditioning system and cause the air con‐

ditioning system (and your air conditioner service station) to

fail.

♦ Bring the customer's attention to the presence of substances

in the air conditioning system thaare noapproved by Volks‐

wagen/Audi, which preventhe air conditioning system from

being flushed and repaired.

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All vehicles

Note

♦ VW/Volkswagen/Audi does noendorse the use of chemical

substances (leak inhibitor additives) for purposes of sealing

leaks in refrigerancircuits.

♦ These chemical substances (leak stop additives) reacmostly

with the ambienair or the humidity to stop leaks in the refrig‐

erancircuit. They cause deposits to build up in the refrigeran

circui(and your air conditioner service station ), cause valves

to malfunction and defects in other components with which

they come into contact. These deposits cannobe completely

removed from the components again (noeven by flushing).

The refrigerancircuican only be repaired by replacing all

components thahave come into contacwith this substance.

♦ There are often no external signs to suggesthachemical

substances (leak stop additives) have been used to seal leaks

in a refrigerancircuit. Often, the stickers provided to mark

such systems are missing. Therefore, exercise caution on ve‐

hicles for which you have no service or repair record.

♦ If there is no suitable air conditioner service station available

for the R1234yf refrigerant, the air conditioner service station

designed for R134a refrigeranmay also be used and the re‐

frigerancircuimay also be flushed with R134a refrigerant.

Using R134a refrigeranto clean the refrigerancircuiis cur‐

rently permissible ⇒ Air conditioning system with R134a re‐

frigerant; Rep. gr. 87 ; General information abouthe air

conditioning system and refrigerancircui.

♦ If during the gas analysis iis found thaR1234yf refrigeran

has been contaminated with a differengas, imusbe extrac‐

ted from the refrigerancircuiand disposed of as a gas of

unknown composition in accordance with the relevanlegisla‐

tion ⇒ VW / Audi-ServiceNeand

⇒ “2.13 Filling contaminated refrigeranin a recycling cylinder

for analysis, processing or disposal”, page 161 .

♦ Contaminated refrigerancan cause decomposition products

to form and accumulate in the refrigerancircuit. These canno

be extracted with the refrigerant. The contaminated refrigeran

oil, in this case, musbe removed from the refrigerancircui

by flushing with refrigerant.

•

To work as cleanly as possible, withoubeing wasteful of the

refrigerant, withoucomplex assembly work and in an envi‐

ronmentally friendly manner when removing moisture, con‐

taminants (e.g. friction dusand particles from the defective air

conditioner compressor) and old refrigeranoil, the refrigeran

circuimusbe flushed (using R1234yf refrigerant).

The refrigerancircuimusbe cleaned (flushed) with refrigeran

R1234yf:

– If diror other contamination is in the circuit.

– The search for faults in the electrical system, the vacuum sys‐

tem and the air ducts did noturn up any fault.(Moisture is in

the refrigerancircuiand builds up pressure.)

– If the refrigerancircuihas been lefopen for longer than nor‐

mally required for repairs (e.g. following an accident).

– Pressure and temperature measurements in the circuiindi‐

cate thathere is moisture in the refrigerancircuit.

– There is doubabouthe amounof refrigeranoil in the refrig‐

erancircuit.

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– Under certain circumstances if contaminated R1234yf refrig‐

eranwas charged in the refrigerancircui

⇒ “1.5 Renewing components”, page 79 and

⇒ “2.3 Performing gas analysis of refrigerant”, page 134

Note

If contaminated refrigeranis found and components of the re‐

frigerancircuiexhibisigns of internal damage (e.g. corrosion on

the inside of the refrigeranlines or breakdown of the inner layer

of refrigeranhoses), flushing the refrigerancircuimay nobe

sufficient. In this case, all of the components of the refrigeran

circuimusbe renewed (owing to a gas being charged thase‐

verely damaged the components).

– The air conditioner compressor has to be exchanged because

of internal damage (e.g. noisy or lack of power)

⇒ “1.5 Renewing components”, page 79 .

– If iis required by the workshop manual for the specific vehicle

following the renewal of certain components.

Tools required

♦ Air conditioner service station with flushing device (this air

conditioner service station incorporates the auxiliary function

“flushing refrigerancircuit” and the corresponding flushing

device for refrigerancircuits ⇒ Electronic parts catalogue .

♦ Adapter case for Volkswagen/Audi passenger vehicles

⇒ page 105 and ⇒ Electronic parts catalogue .

Note

lk

♦ If you do nohave an air conditioner service station with flush‐

ing device ⇒ Electronic parts catalogue in your workshop, i

may be possible depending on the version of your air condi‐

tioner service station to use the refrigerancircuiflushing

device ⇒ Electronic parts catalogue to flush the refrigeran

circuit. However, the flushing routine musbe performed man‐

ually ⇒ page 159 .

♦ In adapter case passenger vehicle sethere is also a filling

hose with 5/8 -18 UNF connections and large inner diameter,

shortype (commercially available).

1.6.2

Preparations for cleaning refrigerancir‐

cui(flushing with R1234yf refrigerant)

– Drain refrigerancircui

⇒ “2.4 Emptying refrigerancircuit”, page 137 .

– Remove air conditioner compressor ⇒ Heating, air condition‐

ing; Rep. gr. 87 ; Refrigerancircuit; System overview -

refrigerancircui(vehicle-specific workshop manual).

On vehicles with restrictor and reservoir

– Remove restrictor (vehicle-specific) and join the lines toher

again ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircui(vehicle-specific

workshop manual).

– Remove the reservoir (vehicle-specific) and join the lines to‐

her again (using an adapter and the charging hose from the

adapter case for VW/Audi passenger vehicles )

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancir‐

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

cuit; System overview - refrigerancircui(vehicle-specific

workshop manual).

Note

The reservoir could be flushed. However, due to its large interior

volume idraws too much refrigeranand when this is extracted,

the reservoir ices up too heavily. This causes the refrigeranto

evaporate only very slowly, lengthening the extraction process

too much as a result.

On vehicles with expansion valve and receiver

– If possible and necessary with this refrigerancircui(see no‐

tice), remove the receiver or remove the desiccancartridge

from the receiver (vehicle-specific) and join the lines toher

again (using an adapter and the charge hose from the adapter

case for Volkswagen/Audi passenger vehicles )

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancir‐

cuit; System overview - refrigerancircui(vehicle-specific

workshop manual).

Note

♦ Depending on the design, the receiver can be flushed (if nec‐

essary, remove dryer cartridge installed in receiver)

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancir‐

cuit; System overview - refrigerancircui(vehicle-specific

workshop manual).

♦ If the receiver is attached to the condenser, imusnobe re‐

moved for flushing (its design makes isuitable for flushing,

and iis only renewed after flushing)

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

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and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancir‐

cuit; System overview - refrigerancircui(vehicle-specific

workshop manual).

♦ With condensers in which the receiver / desiccancartridge are

integrated and cannobe renewed individually or are noavail‐

able as individual parts, the condenser is to be renewed after

flushing. On these vehicles, the condenser in this case is to

be renewed with the receiver ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerancircuit; System overview - refrigerancir‐

cui(vehicle-specific workshop manual) and ⇒ Electronic

parts catalogue .

♦ Depending on the version, receivers - in which the desiccan

cartridge is to be renewed individually - may feature an addi‐

tional filter element, which will need to be renewed with the

desiccancartridge if necessary.

– On vehicles with a dryer cartridge in the receiver on the con‐

denser (vehicle-specific), remove the dryer cartridge and seal

the opening on the receiver again ⇒ Heating, air conditioning;

Rep. gr. 87 ; Refrigerancircuit; System overview - refrigeran

circui(vehicle-specific workshop manual).

– Remove expansion valve (vehicle-specific) and fian adapter

from the adapter case for Volkswagen/Audi passenger vehi‐

cles in its place

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancir‐

cuit; System overview - refrigerancircui(vehicle-specific

workshop manual).

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Note

If there is noa suitable adapter for the expansion valve in the

adapter case Volkswagen/Audi passenger vehicle se, the re‐

moved expansion valve can also be drilled ou(the old expansion

valve has to be replaced in moscases anyway and is no longer

required).

– The sealing surfaces of the expansion valve musnobe dam‐

aged. If damage is caused to the sealing surfaces, refrigeran

could escape.

– Drill ouexpansion valve.

Note

♦ Before drilling, remove the regulator elemenand drill outhe

expansion valve using e.g. a suitably sized drill bi(diameter

of drill bie.g. 6.0 mm).

♦ Before drilling out, some parts may have to be removed from

the expansion valve depending on the version.

♦ There are differentypes of expansion valve with differende‐

signs. For type -A-, parts -B-, -C- and -D- musbe removed,

for example. Separate componen-D- and then par-E- (the

regulating element). Then drill outhe expansion valve in area

-F- using a suitably sized drill bit.

♦ On version -G-, parts -H-, -I- and -K-, for example, musbe

removed and then area -L- drilled ouusing a suitably sized

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drill bit.

– Clean the drilled ouexpansion valve of swarf (metal particles).

– Reinstall parts -B-, -C- and -D- on type -A- or par-H- on type

-G-.

Note

On vehicles with 2 evaporators, separate the circuito the second

evaporator from the circuiof the firsevaporator and flush iin a

separate work step

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105 and

⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit; Sys‐

tem overview - refrigerancircui(vehicle-specific workshop man‐

ual).

♦ Clean (flush) the refrigerancircui

⇒ “2.12 Cleaning refrigerancircuit”, page 157

1.6.3

Refrigerancircuicleaning procedure

Note

The procedure runs automatically as per the program in the air

conditioner service station ⇒ Operating instructions air condi‐

tioner service station .

♦ After switching on, the flushing circui(refrigerancircuiwith

connecting hoses and flushing device for refrigerancircuits)

is evacuated firsand, in the process, the refrigerancircuiis

checked for leaks (imay be necessary to proceed to the nex

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step manually depending on the version of air conditioning

service station ).

♦ Once the refrigerancircuihas been checked for leaks by

means of evacuating, a certain amounof refrigeranis filled

in the system to check the flushing/refrigerancircuifor correc

assembly (pressure test).

♦ After the pressure test, the refrigeranis extracted, the refrig‐

erancircuiis evacuated again, if necessary, and the cleaning

(flushing) process begins.

♦ A predefined volume of refrigeranis charged in the refrigeran

circuivia the high pressure side of the air conditioner service

station (in the opposite direction of normal flow during air con‐

ditioning system operation and therefore on the low pressure

side of the vehicle's refrigerancircuit). Alternatively, refriger‐

anis charged continually (depending on the internal volume

of the flushing circuie.g. 3 kg) until the refrigerancircuiand

the inspection windows of the flushing device for refrigeran

circuits are completely full with liquid refrigeran(the system

detects, e.g. over a certain period of time, when refrigeran

ceases to flow depending on the version of air conditioner

service station ).

♦ Once the predetermined amounof refrigeranhas been filled

in the system, the heater, for example, of the flushing device

for refrigerancircuits is switched on depending on the type of

air conditioner service station and flushing device for refriger‐

ancircuits (only if the refrigeranis extracted in gaseous form

ouof the flushing device for refrigerancircuits).

♦ When the refrigeranhas been extracted, the heater of the

flushing device for refrigerancircuits is switched off (if fitted),

the refrigerancircuimay have to be evacuated briefly again

depending on the type, and following evacuation the refriger‐

anoil evacuated by the air conditioner service station ouof

the refrigerancircuiis separated of water.

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♦ The procedure for charging with refrigerant, extracting (and

evacuating) is carried outhree times (thameans a total of

four times).

♦ After extracting for the fourth time, the flushing circuiis evac‐

uated depending on the type of air conditioner service station .

1.6.4

Principle circuidiagrams for cleaning

(flushing circuits) - refrigerancircuiwith

expansion valve and receiver

♦ With 1 or 2 evaporators

♦ With and withouhigh-voltage system

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Note

♦ The arrows in the following illustrations show the direction of

refrigeranflow during flushing (during flushing, the refrigeran

flows againsthe direction of flow with normal air conditioning

operation, which is why the high pressure side of the air con‐

ditioner service station is connected on the low pressure con‐

nection of the refrigerancircuito the air conditioner

compressor).

♦ This principle circuidiagram shows a refrigerancircuiwith

expansion valve, receiver and a second evaporator (extra

equipmenon certain vehicles).

♦ On vehicles with expansion valve and receiver, the expansion

valve is removed and an adapter installed in its place. The

receiver is also removed depending on the vehicle and the line

connections to the receiver are joined toher with 2 adapters

and a filling hose.

♦ On vehicles with jusone evaporator, the components from

position “16” are noinstalled or norequired.

♦ Depending on the design of the air conditioner service station

there may be non-return valves installed between the refrig‐

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erancircuiand the air conditioner service station (to assure

the correcdirection of refrigeranflow during flushing).

♦ The adapters from the adapter case for VW/Audi passenger

vehicles have a 5/8 -18 UNF thread. To ensure thathe charge

hoses of the R1234yf- air conditioner service station can be

connected, additional adapters from the case are to be used

adapter case for VW/Audi passenger vehicles ⇒ Electronic

parts catalogue .

♦ Installed in the refrigerancircuion vehicles with a high-volt‐

age system are electrically actuated valves thahave to be

removed for cleaning (flushing) and replaced with manual

shut-off valves or adapters ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerancircui.

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1 - Air conditioner service sta‐

tion

❑ With electronics and

flushing program, air

conditioner service sta‐

tion with flushing device

⇒ Electronic parts cata‐

logue (Tools; Workshop

equipment/tools; Air

conditioning system/

heating)

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❑ If an air conditioner

service station withou

flushing program is

used, the sequence has

to be carried ouman‐

ually (evacuate, flush

4 times with aleas3 kg

of refrigeraneach time

and extracrefrigeran

again, evacuate).

2 - Refrigeranhose of air con‐

ditioner service station

❑ From high pressure side

of air conditioner service

station (normally col‐

oured red) for connect‐

ing low pressure side of

air conditioner compres‐

sor to refrigerancircui

(larger diameter)

3 - Adapter for connection to

low pressure side in refrigeran

circui

❑ Different versions de‐

pending on vehicle

⇒ “1.6.8 Adapters for

setting up flushing cir‐

cuits”, page 105

❑ The item to be used between the refrigeranhose -2- and adapter -3- is adapter - VAS 6338/48- .

❑ From adapter case VW/Audi passenger vehicle se

❑ Depending on the version of adapter, an additional adapter is required here to connecthe charge hose

of the air conditioner service station

Note

♦ The charge hose of the air con‐

ditioner service station has an

M12 x 1.5-6G external thread in

accordance with SAE J639. Lo‐

cated on the adapter for connec‐

tion of the low pressure side is a

5/8 -18 UNF external thread. To

ensure thaboth components

can be connected toher, an

additional adapter is required ⇒

Electronic parts catalogue

(Tools; Workshop equipment/

tools; Air conditioning system/

heating).

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♦ To attain the fastesflow speed

possible, the service coupling is

removed from the charge hose

for purposes of flushing (bottle-

necks are presenin the service

coupling thawould significantly

reduce the flow speed).

4 - Connection of low pressure side in refrigerancircui

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

5 - Adapter for removed expansion valve

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case for VW/Audi passenger vehicles ⇒ Electronic parts catalogue (Tools; Workshop

equipment/tools; Air conditioning/heating)

6 - Evaporator

7 - Connection to receiver

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ Not fitted in vehicles with a dryer cartridge in the receiver on the condenser or with a receiver installed

in the condenser ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit; System overview - refrig‐

erancircui(vehicle-specific workshop manual).

8 - Adapter for bridging removed receiver

❑ Not required on all vehicles

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle se

9 - Charge hose for refrigeran

❑ For example charge hose from adapter case VW/Audi for passenger vehicles

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

10 - Condenser

❑ If a receiver with dryer cartridge is fitted athe condenser, the dryer cartridge musbe removed (seal

receiver aor in condenser again following removal) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircui(vehicle-specific workshop manual).

lk

❑ If the receiver is attached directly to the condenser, flush the system before removing and renewing the

receiver ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit; System overview - refrigerancircui

(vehicle-specific workshop manual).

Note

On certain vehicles, the receiver is

integrated in the condenser and the

desiccancartridge cannobe re‐

newed individually or is noavaila‐

ble individually as a replacemen

part. On these vehicles, the con‐

denser in this case is to be renewed

with the receiver ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refriger‐

ancircuiand ⇒ Electronic parts

catalogue .

11 - Connection for high pressure side on refrigerancircui

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

12 - Adapter for connection of high pressure side in refrigerancircui

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle se

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13 - Charging hose of flushing device for refrigerancircuits

❑ From connection to high pressure side of air conditioner compressor on refrigerancircui(smaller di‐

ameter) to inleof flushing device for refrigerancircuits.

14 - Flushing device for refrigerancircuits

❑ Different versions and differendesign of flushing devices for refrigerancircuits ⇒ Electronic parts cata‐

logue (Tools; Workshop equipment/tools; Air conditioning/heating)

❑ With filter, sighglass, safety valve, heating, refrigerantank, etc. (depending on version).

❑ Depending on the design of the air conditioner service station and the flushing device for refrigeran

circuits, there may be a non-return valve installed athe outleof the flushing device for refrigerancircuits

(to assure the correcdirection of refrigeranflow during flushing).

❑ Depending on the flushing device there may be a 5/8 -18 UNF external thread, a connection for R134a

or a R1234yf high pressure service coupling athe outleto the air conditioner service station

lk

Note

♦ To ensure thathe flushing de‐

vice can be connected to the air

conditioner service station ,

flushing devices with a 5/8 -18

UNF external thread or a con‐

nection for an R134a low pres‐

sure service coupling require an

additional adapter to facilitate

connection of the R1234yf low

pressure service coupling or the

charge hose to the air condition‐

er service station (with an M12 x

1.5-6G external thread in ac‐

cordance with SAE J639) athe

outleof the flushing device.

♦ The charge hose of the air con‐

ditioner service station has an

M12 x 1.5-6G external thread in

accordance with SAE J639. De‐

pending on the type of service

connection, there may be a low

pressure service coupling in ac‐

cordance with SAE J639 for the

R1234yf refrigerant, an M12 x

1.5-6G internal thread in accord‐

ance with SAE J639, a service

connection for an R134a low

pressure service coupling or a

5/8 - 18 UNF external thread on

the flushing device for refrigeran

circuits. To ensure thaboth

components can be connected

to each other, an additional

adapter may be necessary ⇒

Electronic parts catalogue .

♦ Since refrigeranis only drawn in

by the air conditioner service sta‐

tion aa low flow speed, the low

pressure service coupling can be

used here.

15 - Refrigeranhose of air conditioner service station

❑ From the low pressure side of the air conditioner service station (normally coloured blue) to the outleof

the flushing device for refrigerancircuits.

16 - Adapter to seal outleto second evaporator

❑ Only required on certain vehicles with “second evaporator” (optional equipment)

❑ From adapter case VW/Audi passenger vehicle se

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17 - Adapter to seal outleto second evaporator

❑ Only required on certain vehicles with “second evaporator” (optional equipment)

❑ From adapter case VW/Audi passenger vehicle se

18 - Connection of low pressure side in refrigerancircuito second evaporator

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ Only fitted on certain vehicles with “second evaporator” (optional equipment)

19 - Connection of high pressure side on refrigerancircuito second evaporator

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ Only fitted on certain vehicles with “second evaporator” (optional equipment)

20 - Adapter for removed expansion valve on second evaporator

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ Only required on certain vehicles with “second evaporator” (optional equipment)

❑ From adapter case VW/Audi passenger vehicle se

21 - Second evaporator

❑ Only fitted on certain vehicles with “second evaporator” (optional equipment)

1.6.5

Principle circuidiagrams for cleaning

(flushing circuits) - refrigerancircuiwith

restrictor and receiver (withouhigh-volt‐

age system)

Note

♦ On vehicles with restrictor and reservoir, the restrictor and the

reservoir musbe removed. The lines thawere detached to

remove the restrictor are reinstalled. The line connections to

the removed reservoir are joined toher with 2 adapters and

the charge hose (from the adapter case for VW/Audi passen‐

ger vehicles ).

♦ This layouwith restrictor and refrigerancircuireservoir is

currently noused aVolkswagen/Audi.

♦ The arrows in the following illustrations show the direction of

refrigeranflow during flushing (during flushing, the refrigeran

flows againsthe direction of flow with normal air conditioning

operation, which is why the high pressure side of the air con‐

ditioner service station is connected on the low pressure con‐

nection of the refrigerancircuito the air conditioner

compressor).

♦ Depending on the design of the air conditioner service station

there may be non-return valves installed between the refrig‐

erancircuiand the air conditioner service station (to assure

the correcdirection of refrigeranflow during flushing).

♦ The adapters from the adapter case for VW/Audi passenger

vehicles have a 5/8 -18 UNF thread. To ensure thathe charge

hoses of the R1234yf- air conditioner service station can be

connected, additional adapters from the case are to be used

adapter case for VW/Audi passenger vehicles .

102

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1 - Air conditioner service sta‐

tion

❑ With electronics and

flushing program, e.g.

air conditioner service

station with flushing de‐

vice ⇒ Electronic parts

catalogue (Tools; Work‐

shop equipment/tools;

Air conditioning/heat‐

ing)

lk

❑ If an air conditioner

service station withou

flushing program is

used, the sequence has

to be carried ouman‐

ually (evacuate, flush

4 times with aleas3 kg

of refrigeraneach time

and extracrefrigeran

again, evacuate).

2 - Refrigeranhose of air con‐

ditioner service station

❑ From high pressure side

of air conditioner service

station (normally col‐

oured red) for connect‐

ing low pressure side of

air conditioner compres‐

sor to refrigerancircui

(larger diameter)

3 - Adapter for connection to

low pressure side in refrigeran

circui

❑ Different versions de‐

pending on vehicle

⇒ “1.6.8 Adapters for

setting up flushing cir‐

cuits”, page 105

❑ The item to be used between the refrigeranhose -2- and adapter -3- is adapter - VAS 6338/48- .

❑ From adapter case VW/Audi passenger vehicle se

Note

♦ The charge hose of the air con‐

ditioner service station has an

M12 x 1.5-6G external thread in

accordance with SAE J639. Lo‐

cated on the adapter for connec‐

tion of the low pressure side is a

5/8 -18 UNF external thread. To

ensure thaboth components

can be connected to each other,

an additional adapter is required

⇒ Electronic parts catalogue .

♦ To attain the fastesflow speed

possible, the service coupling is

removed from the charge hose

for purposes of flushing (bottle-

necks are presenin the service

coupling thawould significantly

reduce the flow speed).

1. Refrigerancircui

103

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lk

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

4 - Connection of low pressure side in refrigerancircui

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ On refrigeranline from air conditioner compressor to reservoir

5 - Connection to reservoir

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ On refrigeranline from air conditioner compressor to reservoir

6 - Adapter for bridging removed reservoir

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle se

7 - Charge hose for refrigeran

❑ For example charge hose from adapter case VW/Audi for passenger vehicles

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

8 - Adapter for bridging removed reservoir

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle se

9 - Connection to reservoir

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

10 - Evaporator

11 - Location of restrictor

❑ The restrictor is removed.

❑ Remove restrictor ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit; System overview - re‐

frigerancircui(vehicle-specific workshop manual).

12 - Threaded connection in refrigeranline

❑ Screw back toher following removal of the restrictor ⇒ Heating, air conditioning; Rep. gr. 87 ; Re‐

frigerancircuit; System overview - refrigerancircui(vehicle-specific workshop manual).

13 - Condenser

14 - Connection for high pressure side on refrigerancircui

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

15 - Adapter for connection of high pressure side in refrigerancircui

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle se

16 - Charging hose of flushing device for refrigerancircuits

❑ From connection to high pressure side of air conditioner compressor on refrigerancircui(smaller di‐

ameter) to inleof flushing device for refrigerancircuits.

17 - Flushing device for refrigerancircuits

❑ Different versions and differendesign of flushing devices for refrigerancircuits ⇒ Electronic parts cata‐

logue (Tools; Workshop equipment/tools; Air conditioning/heating)

❑ With filter, sighglass, safety valve, heating, refrigerantank, etc. (depending on version).

❑ Depending on the design of the air conditioner service station and the flushing device for refrigeran

circuits, there may be a non-return valve installed athe outleof the flushing device for refrigerancircuits

(to assure the correcdirection of refrigeranflow during flushing).

❑ Depending on the layouof the flushing device for refrigerancircuits, there may be a connection for a

service coupling for refrigerancircuits athe outleand possibly the inleof the flushing device (instead

of a 5/8-18 UNF external thread). If a service connection with a valve is installed athe outleof the

flushing device, this valve musbe opened completely when the service coupling is connected (an in‐

completely opened valve represents a bottle-neck). If a connection for a service coupling is presena

the inleof the flushing device, the inlemusbe converted in such a way thathe refrigeranhose coming

from the vehicle can be connected directly (a service coupling and a valve in the inleof the flushing

device represena bottle-neck thacan hinder the flow of refrigeranouof the vehicle into the flushing

device and thereby affecthe flushing process).

104

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18 - Refrigeranhose of air conditioner service station

❑ From the low pressure side of the air conditioner service station (normally coloured blue) to the outleof

the flushing device for refrigerancircuits.

1.6.6

Principle circuidiagrams for cleaning

(flushing circuits) - vehicles with high-

voltage system (withouauxiliary air

conditioning functions)

Note

♦ The refrigerancircuiis cleaned in 2 flushing cycles (firsthe

section with the evaporator in the fronheating and air condi‐

tioning uniand then the section with the heaexchanger for

high-voltage battery or evaporator in the battery cooling mod‐

ule) ⇒ page 105

♦ On vehicles with 2 evaporators or an evaporator and heaex‐

changer, separate the circuito the second evaporator or the

heaexchanger from the circuiof the firsevaporator via hand

shut-off valves, and flush iin a separate work step

⇒ page 105 and ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerancircuit; System overview - refrigerancircui(vehi‐

cle-specific workshop manual).

♦ The layouof the various flushing circuits for these vehicles is

similar to thaon a vehicle with 2 evaporators.

lk

1.6.7

Principle circuidiagrams for cleaning

(flushing circuits) - vehicles with high-

voltage system (with auxiliary air condi‐

tioning functions, e.g. heapump mode)

Note

♦ The refrigerancircuiis cleaned in several flushing cycles

⇒ page 105 and ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerancircui(cleaning refrigerancircuiof air condition‐

ing system).

♦ For flushing, the circuiis spliinto several sections and then

flushed in one cleaning cycle respectively. The division is per‐

formed by means of the integrated electric valves thaare

switched electrically and the manual shut-off valves thaare

switched manually ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerancircui(cleaning refrigerancircuiof air condition‐

ing system).

♦ The layouof the various flushing circuits for these vehicles is

described in the relevanvehicle-specific workshop manual ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerancircui

(cleaning refrigerancircuiof air conditioning system

⇒ “1.6.4 Principle circuidiagrams for cleaning (flushing cir‐

cuits) - refrigerancircuiwith expansion valve and receiver”,

page 97 ).

1.6.8

Adapters for setting up flushing circuits

♦ The following table contains the various adapters thaare nec‐

essary to connecthe air conditioner service station to the

refrigerancircuifor purposes of flushing and to bridge the

1. Refrigerancircui

105

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removed reservoir or receiver and expansion valve (vehicle-

specific).

♦ The adapters from the adapter case for VW/Audi passenger

vehicles have a 5/8 -18 UNF thread. To ensure thathe charge

hoses of the R1234yf- air conditioner service station can be

connected (M12 x 1.5-6G in accordance with SAE J639), ad‐

ditional adapters from the case are to be used.

♦ Using a charge hose with 5/8 -18 UNF connections (shorver‐

sion, e.g. charge hose ), join both adapters, which were in‐

stalled in place of the reservoir or receiver (included in adapter

case for VW/Audi passenger vehicles ).

♦ If a flushed refrigerancircuiis nogoing to be reassembled

immediately after flushing, leave the adapters on the connec‐

tions and seal the connections on the adapters using the

lk

sealing caps - VAS 6338/30- (from adapter case for VW/Audi

passenger vehicles ).

♦ Depending on the version of the air conditioner compressor

and the production period, differenconnection and sealing

methods may have been used for the refrigerancircui⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit;

System overview - refrigerancircui(vehicle-specific work‐

shop manual).

Block or threaded connections

– Threaded connection -A-

– Block connection -B-

Block connections with various types of seals

– Block connection with radial sealing connection -A- (with guide

made from plastic or metal -B-)

– Block connection with axial sealing connection -C-.

Assembling flushing circui- passenger cars ⇒ page 106 or com‐

mercial vehicles ⇒ page 107 .

Passenger cars

Assembling flushing circui

Arteon 2018 ▶

Atlas 2017 ▶

CC 2012 ▶

e-Golf 2014 ▶, e-Golf 2014 ▶ with heapump

Golf 2013 ▶, Golf Estate 2014 ▶

Golf 2015 ▶, Golf Estate 2015 ▶

Golf GTE

⇒ page 107

⇒ page 108

⇒ page 109

⇒ page 110

⇒ page 111

⇒ page 113

Golf Cabriole2012 ▶

106

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Assembling flushing circui

Golf SV 2015 ▶

Jetta 2015 ▶

Jetta 2018 ▶

Passa2015 ▶, PassaEstate 2015 ▶

Passa2018 ▶, PassaEstate 2018 ▶

PassaGTE

Polo 2014 ▶

Polo 2018 ▶

⇒ page 110

⇒ page 118

⇒ page 113

⇒ page 111

⇒ page 114

⇒ page 113

⇒ page 115

Scirocco 2015 ▶

Sharan 2016 ▶

lk

The Beetle 2017 ▶, The Beetle Cabriole2017 ▶

The Beetle 2018 ▶, The Beetle Cabriole2018 ▶

Tiguan 2016 ▶, Tiguan MEX 2017 ▶

Touareg 2015 ▶

Touran 2016 ▶

up! 2017 ▶

⇒ page 118

⇒ page 116

⇒ page 110

⇒ page 117

e-up! 2017 ▶

Commercial vehicles ⇒ page 107

Note

For a detailed description of assembling the flushing circuit, refer

to the workshop manual ⇒ Air conditioning system with refrigeran

R134a; Rep. gr. 00 ; Cleaning refrigerancircuit, commercial ve‐

hicles .

Assembling flushing circui

Caddy 2016 ▶

Crafter 2017 or MAN TGE ▶

Transporter 2016 ▶

⇒ page 119

⇒ page 120

Passenger cars

Arteon 2018 ▶

Vehicle

Adapters required for refrigeranpipes Adapters required for re‐

Miscellaneous

to air conditioner compressor

frigeranpipes to receiver

Arteon 2018 ▶ ♦ Low-pressure side adapter - VAS

6338/12-

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

♦ High pressure side adapter - VAS

6338/3-

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦ Adapter - VAS 6338/48- for air con‐

ditioner service station

After flu–shing, install a

new expansion valve.

1. Refrigerancircui

107

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Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

Atlas 2017 ▶

Vehicle

Adapters required for refrigeranpipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigeranpipes to receiver

Atlas 2017 ▶ ♦ Low-pressure side adapter - VAS

6338/12-

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

♦

High pressure side adapter - VAS

After flu–shing, install a

new desiccanbag/car‐

tridge.

lk

6338/3-

♦ Adapter - VAS 6338/48- for air con‐

ditioner service station

♦ Low-pressure line for

second evaporator

adapter - VAS 6338/3-

After flu–shing, install a

new expansion valve.

♦ High-pressure line for

second evaporator

adapter - VAS

6338/60-

♦ The refrigeranlines to

the second evaporator

musbe loosened suf‐

ficiently so thathe

adapter can be fitted

withoudeforming the

refrigeranlines.

♦ Low-pressure line for

2nd evaporator, seal‐

ing adapter - VAS

6338/63- for fronre‐

frigerancircuit.

♦ High-pressure line for

2nd evaporator, seal‐

ing adapter - VAS

6338/5- for fronrefrig‐

erancircuit.

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

108

Rep. gr.87 - Air conditioning system

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CC 2012 ▶

Vehicle Adapters required for refrigeranpipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigeranpipes to receiver

CC 2012 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air conditioner

service station and adapter - VAS

6338/48- .

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/18- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦

High pressure side adapter - VAS

6338/3-

After flu–shing, install a

new expansion valve.

If a Sho–wa condenser

is fitted, leave the re‐

ceiver fitted and flush

the refrigerancircuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

e-Golf 2014 ▶, e-Golf 2014 ▶ with heapump

Vehicle

Adapters required for refriger‐ Adapters required for re‐

Miscellaneous

anpipes to air conditioner frigeranpipes to receiver

compressor

e-Golf 2014 ►

♦ Low pressure side adapter

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

Remove–desiccancar‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

After flu–shing, install a

new dryer cartridge.

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new expansion valve.

♦ Flushing electric air condi‐

tioner compressor adapter

- VAS 6338/40- and adapt‐

er - VAS 6338/41- , see

notes: ⇒ page 155

e-Golf 2014 ► with

heapump

♦ Low pressure side adapter

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

Remove–reservoir (dry‐

er), and bridge refriger‐

anpipes.

Star“B–asic setting” in

⇒ Vehicle diagnostic

tester, and starthe

function “Charge refrig‐

erancircuit”.

Join tw–o adapters -

VAS 6338/6- with hose ♦ This will open the elec‐

♦ High pressure side adapter

- VAS 6338/3-

- VAS 6338/31- toh‐

er.

trical valves in the re‐

frigerancircuit.

♦ Flushing electric air condi‐

tioner compressor adapter

- VAS 6338/40- and adapt‐

er - VAS 6338/41- , see

notes: ⇒ page 155

♦ Leave vehicle diagnos‐

tic tester connected to

keep the valves open.

After flu–shing, install a

new reservoir.

1. Refrigerancircui

109

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lk

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

Golf 2013 ▶, Golf 2015 ▶, Golf Estate 2014 ▶, Golf Estate 2015

▶, Golf SV 2015 ▶, Touran 2016 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

Miscellaneous

anpipes to air conditioner frigeranpipes to receiver

compressor

Golf 2013 ▶, Golf 2015 ♦ Low pressure side adapter

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

▶, Golf Estate 2015 ▶,

Golf Estate 2014 ▶,

Golf SV 2015 ▶, Tour‐

an 2016 ▶

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new expansion valve.

If a cond–enser/receiver

with permanently in‐

stalled desiccanbag /

cartridge is installed,

leave the condenser/

receiver in situ and

flush the refrigerancir‐

cuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

110

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Golf GTE, PassaGTE

Vehicle

Adapters required for refriger‐ Adapters required for re‐

anpipes to air conditioner frigeranpipes to receiver

compressor

Miscellaneous

Golf GTE, Passa

GTE

♦ Low pressure side adapter There are two versions of

- VAS 6338/12- connected the receiver. See vehicle

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

to air conditioner service

specific repair manual.

station and adapter - VAS ♦ Receiver with perma‐

6338/48- .

nently fitted desiccator.

Repl–ace shut-off

♦ High pressure side adapter

- VAS 6338/3-

Can–be flushed.

After flu–shing, install a

new receiver.

valves -N541- and -

N542- with two shut-off

taps - VAS 6338/42- .

See notes

♦ Flushing electric air condi‐

tioner compressor adapter

- VAS 6338/40- and adapt‐

er - VAS 6338/41- , see

notes: ⇒ page 155

♦

Receiver with desic‐

canbag or cartridge

⇒ page 112

Remove–restrictor in re‐

frigeranline to heaex‐

changer for high-volt‐

age battery, and drill i

ou(see notes below)

⇒ page 112 .

Remo–ve desiccan

bag/cartridge and seal

receiver.

After flu–shing, install a

new desiccanbag/car‐

tridge.

lk

♦ With an electric air con‐

ditioning compressor,

the refrigeranoil is to

be removed in the di‐

rection of flow by flush‐

ing (flushing in the op‐

posite direction of flow

is nopossible due to

the integrated valves).

♦

The air conditioner

compressor musbe

positioned for flushing

so thathe connection

for the refrigeranline

on the high pressure

side is athe lowes

poinpossible.

1. Refrigerancircui

111

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Note

♦ In the Golf GTE and PassaGTE, the refrigerancircuiis

flushed in 2 cycles. For the firscycle, the adapter for shut-off

lk

valve -N541- is open, and the adapter for shut-off valve -N542-

is closed. This will cause the refrigerancircuiwith the evap‐

orator in the heater and air conditioning unito be flushed. For

the second cycle, the adapter for shut-off valve -N541- is

closed, and the adapter for shut-off valve -N542- is open. The

refrigerancircuiwith the evaporator in the heaexchanger for

high-voltage battery is flushed in this way ⇒ Heating, air con‐

ditioning system; Rep. gr. 87 ; Refrigerancircui(vehicle-

specific workshop manual).

♦ The illustration shows a refrigeranline -A- with a permanently

installed restrictor -B- (withoustrainer). This refrigeranline

musbe drilled open with a suitable 5 mm drill bi(remove the

restrictor if iis removable), and imusbe cleaned before iis

installed in the flushing circuit. After flushing, the drilled ou

refrigeranline musbe renewed ⇒ Electronic parts cata‐

logue .

♦ The diameter of the shown restrictor hole -B- is

approx. 0.7 mm. Depending on the refrigeranline version, this

restrictor is permanently installed or ican be removed. For the

removable version a strainer may be fitted to preventhe re‐

strictor hole from being blocked by suspended particles.

♦ The type of receiver may differ depending on the manufacturer

of the condenser. In this example, the receiver is integrated in

the condenser. Installed in the integrated receiver is a desic‐

cancartridge thais currently noalways available as a re‐

placemenpart. Therefore, imay be necessary to renew the

complete condenser after eliminating any faults on vehicles

fitted with this condenser ⇒ Electronic parts catalogue and ⇒

Heating, air conditioning system; Rep. gr. 87 ; Refrigerancir‐

cui(vehicle-specific workshop manual).

♦ On vehicles having condensers with an integrated receiver/

desiccancartridge which cannobe renewed separately or

which is noavailable as a replacemenpart, the condenser

musbe renewed after flushing (with installed desiccancar‐

tridge) ⇒ Heating, air conditioning system; Rep. gr. 87 ;

Refrigerancircui(vehicle-specific workshop manual) and ⇒

Electronic parts catalogue .

112

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Golf Cabriole2012 ▶, Scirocco 2015 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

anpipes to air conditioner frigeranpipes to receiver

compressor

Miscellaneous

Golf Cabriole2012 ▶, ♦ Low pressure side adapter There are two versions of

Scirocco 2015 ▶ - VAS 6338/12- connected the receiver. See vehicle

to air conditioner service specific repair manual.

Install a–dapter - VAS

6338/18- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

station and adapter - VAS ♦ Receiver with perma‐

6338/48- .

nently fitted desiccator.

♦ High pressure side adapter

- VAS 6338/3-

Can–be flushed.

After flu–shing, install a

new receiver.

After flu–shing, install a

new expansion valve.

♦

Receiver with desic‐

canbag or cartridge

Remo–ve desiccan

bag/cartridge and seal

receiver.

After flu–shing, install a

new desiccanbag/car‐

tridge.

lk

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

Passa2015 ▶, PassaEstate 2015 ▶, Passa2018 ▶, Passa

Estate 2018 ▶

Note

In the Passa2015 and PassaEstate 2015 with bi-turbo engine,

the refrigerancircuiis noflushed. In these vehicles, iwould

require too much efforto remove the expansion valve. If the air

conditioner compressor is defective, check whether swarf has

entered the condenser or whether there is swarf in the condenser

outlet. If there is only swarf on the inleside bunoon the outle

side, renew only the condenser and the air conditioner compres‐

sor.

Vehicle

Adapters required for refriger‐ Adapters required for re‐

Miscellaneous

anpipes to air conditioner frigeranpipes to receiver

compressor

Passa2015 ▶, Pas‐ ♦ Low pressure side adapter

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/18- or adapter -

VAS 6338/38- (or a dril‐

led ouexpansion valve

⇒ page 96 ) in place of

expansion valve

saEstate 2015 ▶,

Passa2018 ▶, Pas‐

saEstate 2018 ▶

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new expansion valve.

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Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

Polo 2014 ►

Vehicle

Adapters required for refrigeranpipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigeranpipes to receiver

Polo 2014 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air conditioner

service station and adapter - VAS

6338/48- .

Remove–desiccancar‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/39- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

After flu–shing, install a

new dryer cartridge.

♦

High pressure side adapter - VAS

6338/3-

After flu–shing, install a

new expansion valve.

♦ For air conditioner compressors 6Q0

820 808 F and 6Q0 820 808 G on high

pressure side adapter - VAS 6338/2-

lk

Polo 2018 ▶

Vehicle

Adapters required for refrigeranpipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigeranpipes to receiver

Polo 2018 ▶ ♦ Low-pressure side adapter - VAS

6338/12-

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

♦

High pressure side adapter - VAS

6338/3-

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦ Adapter - VAS 6338/48- for air condi‐

tioner service station

After flu–shing, install a

new expansion valve.

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

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Sharan 2016 ▶

Vehicle

Adapters required for refrigeranpipes Adapters required for re‐

Miscellaneous

to air conditioner compressor

frigeranpipes to receiver

Sharan 2016 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air condi‐

tioner service station and adapter -

VAS 6338/48- .

Remove–desiccancar‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/18- in place of

fronexpansion valve

(or a drilled-ouexpan‐

sion valve ⇒ page 96 )

After flu–shing, install a

new dryer cartridge.

♦ Low-pressure line for

second evaporator

adapter - VAS 6338/3-

♦ High pressure side adapter - VAS

6338/3-

Install a–dapter - VAS

6338/33- in place of

rear expansion valve

(or a drilled-ouexpan‐

sion valve ⇒ page 96 )

♦ High-pressure line for

second evaporator

adapter - VAS 6338/4-

After flu–shing, install a

new expansion valve.

♦ The refrigeranlines to

the second evaporator

musbe loosened suf‐

ficiently so thathe

adapter can be fitted

withoudeforming the

refrigeranlines.

♦ Sealing adapter - VAS

6338/5- for fronrefrig‐

erancircuit.

♦ Sealing adapter - VAS

6338/11- for fronre‐

frigerancircuit.

lk

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

1. Refrigerancircui

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lk

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Tiguan 2016 ▶, Tiguan MEX 2017 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

anpipes to air conditioner frigeranpipes to receiver

compressor

Miscellaneous

Tiguan 2016 ▶, Ti‐

guan MEX 2017 ▶

♦ Low pressure side adapter

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led ouexpansion valve

⇒ page 96 )

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new expansion valve.

If a cond–enser/receiver

with permanently in‐

stalled desiccanbag /

cartridge is installed,

leave the condenser/

receiver in situ and

flush the refrigerancir‐

cuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

Touareg 2015 ▶

Vehicle

Adapters required for refrigeran

Adapters required for re‐

Miscellaneous

pipes to air conditioner compressor frigeranpipes to receiver

Touareg 2015 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air condi‐

tioner service station and adapter

- VAS 6338/48- .

Remove–desiccancar‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/17- or adapter -

VAS 6338/33- in place

of fronand rear expan‐

sion valves (or a drilled

ouexpansion valve

⇒ page 96 )

After flu–shing, install a

new dryer cartridge.

♦ Low-pressure line for

second evaporator

adapter - VAS 6338/3-

♦ High-pressure side adapter - VAS

6338/2- or adapter - VAS 6338/3-

♦

Electrical air conditioner com‐

pressor, adapter - VAS 6338/40-

and adapter - VAS 6338/41-

After flu–shing, install a

new expansion valve.

♦ High-pressure line for

second evaporator

adapter - VAS 6338/4-

♦ Sealing adapter - VAS

6338/5- for fronrefrig‐

erancircuit.

♦ Sealing adapter - VAS

6338/11- for fronre‐

frigerancircuit.

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Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

lk

up! 2017 ▶, e-up! 2017 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

anpipes to air conditioner frigeranpipes to receiver

compressor

Miscellaneous

up! 2017 ▶, e-up! 2017 ♦ Low pressure side adapter

Receive–r can be flush‐

ed.

Install a–dapter - VAS

6338/36- or adapter -

VAS 6338/34- (or a dril‐

led ouexpansion valve

⇒ page 96 ) in place of

expansion valve

▶

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

After flu–shing, install a

new receiver.

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new expansion valve.

♦ Flushing electric air condi‐

tioner compressor adapter -

VAS 6338/40- and adapter

- VAS 6338/41- , see notes:

⇒ page 155

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

1. Refrigerancircui

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Jetta 2015 ▶, The Beetle 2017 ▶, The Beetle Cabriole2017 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

anpipes to air conditioner frigeranpipes to receiver

compressor

Miscellaneous

Jetta 2015 ▶, The Bee‐ ♦ Low-pressure side adapter

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/18- (or a drilled

ouexpansion valve

⇒ page 96 ) in place of

expansion valve.

tle 2017 ▶, The Beetle

Cabriole2017 ▶

- VAS 6338/12-

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

lk

new desiccanbag/car‐

♦ Adapter - VAS 6338/48- for

air conditioner service sta‐

tion

tridge.

After flu–shing, install a

new expansion valve.

If a cond–enser/receiver

with permanently in‐

stalled desiccanbag /

cartridge is installed,

leave the condenser/

receiver in situ and

flush the refrigerancir‐

cuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccancartridge which cannobe renewed separately or which is

noavailable as a separate replacemenpart, the condenser mus

be renewed after flushing (toher with integrated desiccancar‐

tridge) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircuiand ⇒ Electronic

parts catalogue .

Jetta 2018 ▶, The Beetle 2018 ▶, The Beetle Cabriole2018 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

Miscellaneous

anpipes to air conditioner frigeranpipes to receiver

compressor

Jetta 2018 ▶, The Bee‐ ♦ Low-pressure side adapter

Remo–ve desiccan

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/18- (or a drilled

ouexpansion valve

⇒ page 96 ) in place of

expansion valve.

tle 2018 ▶, The Beetle

Cabriole2018 ▶

- VAS 6338/12-

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new desiccanbag/car‐

tridge.

♦ Adapter - VAS 6338/48- for

air conditioner service sta‐

tion

After flu–shing, install a

new expansion valve.

If a cond–enser/receiver

with permanently in‐

stalled desiccanbag /

cartridge is installed,

leave the condenser/

receiver in situ and

flush the refrigerancir‐

cuit.

After flu–shing, install a

new receiver.

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Commercial vehicles

Note

For a detailed description of assembling the flushing circuit, refer

to the workshop manual ⇒ Air conditioning system with refrigeran

R134a; Rep. gr. 00 ; Cleaning refrigerancircuit, commercial ve‐

hicles .

Caddy 2016 ▶

Vehicle

Adapters required for re‐ Adapters required for re‐

Miscellaneous

frigeranpipes to air con‐ frigeranpipes to receiver

ditioner compressor

Caddy 2016 ▶

♦

Low-pressure side

adapter - VAS

6338/12-

Vehicle–s with Modine

condensers:

Install a–dapter - VAS

6338/18- (or a drilled

ouexpansion valve

⇒ page 96 ) in place of

expansion valve.

♦ Remove desiccanbag

and seal receiver.

♦

High pressure side

adapter - VAS 6338/3-

Vehicle–s with Showa

condensers:

After flu–shing, install a

new expansion valve.

Adapter - VAS

♦

Flush desiccancar‐

tridge also.

6338/48- for air condi‐

tioner service station

After flu–shing, install a

new desiccanbag/car‐

tridge.

Crafter 2017 or MAN TGE ▶

Vehicle

Adapters required for re‐ Adapters required for re‐

Miscellaneous

frigeranpipes to air con‐ frigeranpipes to receiver

lk

ditioner compressor

Crafter 2017 or MAN

TGE ▶

♦

Low-pressure side

adapter - VAS

6338/12-

♦ If the vehicle has a sec‐

ond evaporator, the

rear refrigerancircui

(roof air conditioning

system) musbe rinsed

first.

Install a–dapter - VAS

6338/38- (or a drilled

ouexpansion valve

⇒ page 96 ) in place of

expansion valve.

♦

High pressure side

adapter - VAS 6338/3-

After flu–shing, install a

new expansion valve.

Adapter - VAS

Remove–desiccanbag

and seal receiver.

6338/48- for air condi‐

tioner service station

After flu–shing, install a

new desiccanbag.

♦ Adapter - VAS 6338/5-

for low pressure side of

fronrefrigerancircuit.

♦

Adapter - VAS

6338/63- for high pres‐

sure side of fronrefrig‐

erancircuit.

♦ Adapt low pressure line

for second evaporator

using adapter - VAS

6338/3- .

♦

Adaphigh pressure

line for second evapo‐

rator using adapter -

VAS 6338/60- .

1. Refrigerancircui

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Transporter 2016 ▶

Vehicle

Adapters required for re‐ Ad^l^kapters required for re‐

frigeranpipes to air con‐ frigeranpipes to receiver

ditioner compressor

Miscellaneous

Transporter 2016 ▶

♦

Low-pressure side

adapter - VAS

6338/12-

Remove–desiccanbag

and seal receiver.

After flu–shing, install a

new desiccanbag.

Adapter - VAS

Install a–dapter - VAS

6338/56- (or a drilled

ouexpansion valve

⇒ page 96 ) in place of

expansion valve.

♦

High pressure side

♦

adapter - VAS 6338/3-

6338/63- for high pres‐

sure side of fronrefrig‐

erancircuit.

Remove–and drill open

expansion valve for

rear evaporator

Adapter - VAS

6338/48- for air condi‐

tioner service station

Adapter - VAS

6338/64- for low pres‐

sure side of fronrefrig‐

erancircuit.

⇒ page 96 .

After fl–ushing, install

new expansion valves.

♦ Adapt low pressure line

for second evaporator

using adapter - VAS

6338/61- .

♦ Seal low pressure line

for 2nd evaporator us‐

ing adapter - VAS

6338/62- .

♦

Adaphigh pressure

line for second evapo‐

rator using adapter -

VAS 6338/60- .

On ve–hicles with 1

evaporator system,

flush once.

On ve–hicles with 2

evaporator systems,

flush twice.

1.6.9

General information aboublowing

through with compressed air or nitrogen

In order to remove moisture and other contaminants as well as

old refrigeranoil from the refrigerancircuias cleanly as possi‐

ble, withouwasting the refrigeranand in an uncomplicated and

environmentally compatible way, the refrigerancircuimusbe

cleaned with refrigeranR1234yf (flushed with R1234yf refriger‐

ant) ⇒ “1.6 Cleaning refrigerancircuit”, page 92 .

Blowing through the refrigerancircuiwith compressed air and

nitrogen is a method to be applied e.g. only if individual compo‐

nents are to be cleaned.

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Note

♦ The refrigerancircuishould then only be blown through with

compressed air and then with nitrogen if there are no means

of flushing the refrigerancircuit, or the amounof work nec‐

essary to flush individual components would be too grea

(removed refrigeranlines can also be blown through, for ex‐

ample, to remove low level contaminants and moisture withou

taking much time).

♦ The method of blowing through the whole refrigerancircui

with compressed air and nitrogen often requires a lomore

work than cleaning (flushing) with refrigeranR1234yf. When

flushing with refrigeranR1234yf, cleaning of the components

is also far more efficient. Iis therefore always besto flush the

system in the evenof complaints (the method of blowing

through should only be selected for certain complaints and for

individual components).

lk

♦ Under certain circumstances imay be sufficient, for example,

to blow through selected components (e.g. individual refriger‐

anlines or refrigeranhoses) with compressed air (e.g. to

force ouold refrigeranoil from individual removed compo‐

nents) or nitrogen (to dry individual components).

♦ Certain contaminants are difficulor impossible to remove

from the refrigerancircuiwith compressed air. These con‐

taminants can be removed, for example, by cleaning (flushing)

with refrigeranR1234yf

⇒ “1.6 Cleaning refrigerancircuit”, page 92 .

♦ When blowing through (with compressed air or nitrogen), the

maximum working pressure should noexceed 15 bar (equa‐

tes to the pressure in a filled refrigerancircuiwith an ambien

temperature of approx. 60°C, if necessary use pressure limiter

for compressed air as well).

♦ If during the gas analysis iis found thaR1234yf refrigeran

has been contaminated with a differengas, imusbe extrac‐

ted from the refrigerancircuiand disposed of as a gas of

unknown composition in accordance with the relevanlegisla‐

tion ⇒ VW / Audi-ServiceNeand ⇒ page 161 .

♦ Contaminated refrigerancan cause decomposition products

to form and accumulate in the refrigerancircuit. These canno

be extracted with the refrigerant. The contaminated refrigeran

oil, in this case, musbe removed from the refrigerancircui

by flushing with refrigeran

⇒ “1.6 Cleaning refrigerancircuit”, page 92 .

♦ If there is no suitable air conditioner service station available

for the R1234yf refrigerant, the air conditioner service station

designed for R134a refrigeranmay also be used and the re‐

frigerancircuimay also be flushed with R134a refrigerant.

Using R134a refrigeranto clean the refrigerancircuiis cur‐

rently permissible ⇒ Air conditioning system with R134a re‐

frigerant; Rep. gr. 87 ; Refrigerancircuit; Flushing (cleaning)

refrigerancircuiwith R134a refrigeran.

CAUTION

Risk of injury from nitrogen escaping under high pressure.

– Use pressure limiter for nitrogen tank.

– Always clean components againsthe direction of refrigeran

flow (flush with R1234yf refrigerant) or blow through.

1. Refrigerancircui

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– Extract the mixture of refrigerant, refrigeranoil, compressed

air or nitrogen escaping ouof the components with an extrac‐

tion system.

Note

Compressed air and nitrogen cannobe blown through the re‐

strictor, expansion valve, air conditioner compressor, receiver or

reservoir.

– In cases where condensers have a drying agencartridge in

the integrated receiver, this drying agencartridge musbe re‐

moved.

Note

♦ With condensers in which the receiver / desiccancartridge are

integrated and cannobe renewed individually, the condenser

lk

is to be renewed after cleaning (flushing).

♦ Depending on the version, receivers - in which the desiccan

cartridge is to be renewed individually - may feature an addi‐

tional filter element, which will need to be renewed with the

desiccancartridge if necessary.

– First blow ouold refrigeranoil and contaminants with com‐

pressed air, then blow oucomponents with nitrogen (clean,

blow ouor dehumidify old refrigeranoil).

– Adapter for connecting pressure hose to refrigerancircui

Adapter case for VW/Audi passenger vehicles ⇒ Electronic

parts catalogue .

To prevenoil and moisture from the compressed air system

making its way into the refrigerancircuit, the following points mus

be observed.

♦ The compressed air musbe fed through a compressed air

cleaning unito clean and dry it. Therefore, use a filter and

dryer for compressed air (included in the supply of tools for

painsystems) ⇒ Electronic parts catalogue .

♦ On refrigeranlines with threads or union nuts on the connec‐

tion, use adapter from refrigerancircuiadapter se- V.A.G

1785- ( adapter - V.A.G 1785/1- to adapter - V.A.G 1785/8- )

to connecthe 5/8" - 18 UNF charges hose (one parof this

adapter is also included in the adapter case for VW/Audi pas‐

senger vehicles ).

♦ On refrigeranlines withouthread or union nuon the con‐

nection (for connection of adapters), use adapter from adapter

case VW/Audi passenger vehicle seor proprietary air blow

gun with rubber nozzle.

Note

Always extracany escaping air and/or nitrogen from the compo‐

nents using appropriate local exhausventilation LEV (e.g. work‐

shop extraction system).

The refrigerancircui(or individual components) musbe blown

through if there are no means of flushing or flushing does noap‐

pear to be the appropriate solution.

– if there is diror contamination in individual components of the

refrigerancircuit.

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– The search for faults in the electrical system, the vacuum sys‐

tem and the air ducts did noturn up any fault.(Moisture is in

the refrigerancircuiand builds up pressure.)

– If the refrigerancircuihas been lefopen for longer than nor‐

mally required for repairs (e.g. following an accident).

– Pressure and temperature measurements in the circuiindi‐

cate thathere is moisture in the refrigerancircuit.

– The vehicle-specific workshop manual deems inecessary af‐

ter replacemenof certain components ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Refrigerancircuit, System overview -

refrigerancircui.

Note

Certain contaminants and old refrigeranoil are difficulor impos‐

sible to remove from the refrigerancircuiwith compressed air or

nitrogen. These contaminants can be removed, for example, by

flushing with refrigeranR1234yf

lk

⇒ “1.6 Cleaning refrigerancircuit”, page 92 .

♦ Blow through refrigerancircuiwith compressed air or nitro‐

gen

⇒ “1.6.10 Blowing through refrigerancircuiwith compressed

air or nitrogen”, page 124

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1.6.10

Blowing through refrigerancircuiwith

compressed air or nitrogen

Note

♦ Vehicles with refrigeranlines thado nohave a thread on

which to connecadapter - 1785- require e.g. a compressed

air gun with rubber nozzle or an adapter from adapter case for

VW/Audi passenger vehicles to blow ouindividual compo‐

nents. When using a compressed air gun with rubber nozzle,

be particularly careful noto damage the connections (do no

crush or scratch them).

♦ The evaporator should be blown through from the connection

to the low pressure side (large diameter), with the expansion

valve or restrictor removed.

♦ Always blow oucomponents againsthe direction of refriger‐

anflow (or flush with R1234yf refrigerant).

♦ Examine the expansion valve; renew if dirty or corroded.

♦ If there are dark sticky deposits in the components, and these

cannobe removed with compressed air, flush these compo‐

nents with refrigeranR1234yf or renew.

♦ Thin, lighgrey deposits on the insides of pipes do noimpair

the function of the components.

♦ After blowing out, renew the receiver (desiccancartridge) or

reservoir and restrictor. In cases where condensers have a

drying agencartridge in the integrated receiver, this drying

agencartridge musbe renewed.

lk

♦ On vehicles having condensers with an integrated receiver/

desiccancartridge which cannobe renewed separately or

which are noavailable as a replacemenpart, the condenser

musbe renewed after flushing the refrigerancircui⇒ Elec‐

tronic parts catalogue and ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerancircuit; System overview - refrigerancir‐

cui(vehicle-specific workshop manual).

♦ Depending on the version, receivers - in which the desiccan

cartridge is to be renewed individually - may feature an addi‐

tional filter element, which will need to be renewed with the

desiccancartridge if necessary.

After blowing outhe refrigerancircuit:

– Renew these vehicle-specific components (restrictor and res‐

ervoir, expansion valve and receiver / dryer cartridge) ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit;

System overview - refrigerancircui(vehicle-specific work‐

shop manual) and ⇒ Electronic parts catalogue

– Depending on complaint, renew air conditioner compressor ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerancircuit;

System overview - refrigerancircui(vehicle-specific work‐

shop manual) and ⇒ Electronic parts catalogue or drain

remaining refrigeranoil from removed air conditioner com‐

pressor ⇒ “1.5 Renewing components”, page 79 and refill with

requisite amounof fresh refrigeranoil ⇒ Heating, air condi‐

tioning; Rep. gr. 00 ; Technical data (vehicle-specific work‐

shop manual) and ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data; Refrigeranoil .

124

Rep. gr.87 - Air conditioning system

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Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

Note

♦ Replacemencompressors contain a certain specified quantity

of refrigeranoil. On vehicles with two evaporators, a certain

amounof refrigeranoil may also have to be filled in the circui

if necessary ⇒ Heating, air conditioning; Rep. gr. 00 ; Tech‐

nical data and ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerancircuit; System overview - refrigerancircui.

♦ If the air conditioner compressor does noneed to be renewed,

replenish the refrigeranoil accordingly up to the prescribed fill

level (empty refrigeranoil and pour the prescribed volume

back into the air conditioner compressor or refrigerancircuit)

⇒ page 79 , ⇒ Heating, air conditioning; Rep. gr. 00 ; Tech‐

nical data; refrigeranoil .

– Completely reassemble the refrigerancircuiagain ⇒ Heat‐

ing, air conditioning; Rep. gr. 87 ; Refrigerancircuit; System

lk

overview - refrigerancircui(vehicle-specific workshop man‐

ual).

– Evacuate and charge the refrigerancircuiin the prescribed

manner ⇒ “2.5 Evacuating refrigerancircuit”, page 140 and

⇒ “2.6 Charging refrigerancircuit”, page 146

– Bring the air conditioning system into operation in the prescri‐

bed manner ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐

erancircuit; Bringing air conditioning system into operation

after charging refrigerancircuiand

⇒ “2.7 Bringing air conditioning system into service after

charging”, page 149

1. Refrigerancircui

125

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Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...

Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

1.7

Checking pressures with pressure

gauge

⇒ “1.7.1 Display on pressure gauges”, page 126

⇒ “1.7.2 Pressure gauges enable the following tesand meas‐

uremenwork”, page 126

1.7.1

Display on pressure gauges

1 - Temperature scale for R1234yf refrigeran(CF CF = CH )

3

2

in °C

lk

2 - Pressure scale in bar overpressure

Note

♦ Pressure is indicated in various units: 1 MPa (Mega-Pascal)

is equal to 10 bar or 145 psi; 1 bar absolute pressure is equal

to 0 bar, which is abouthe same as ambienpressure (at‐

mospheric pressure).

♦ This diagram shows a pressure gauge displaying pressure on

the low pressure side. The display here is shown in bar over‐

pressure (noticeable by “-1” in the display).

In addition to the pressure scale, the pressure gauges can have

one or more temperature scales. The scale values for R1234yf

are assigned according to the vapour pressure table. Because

differenrefrigerants have differenvapour pressures athe same

temperature, each temperature scale is labelled for the respective

refrigerant.

♦ Pressure gauges enable the following testing and measuring

measures

⇒ “1.7.2 Pressure gauges enable the following tesand meas‐

uremenwork”, page 126 .

1.7.2

Pressure gauges enable the following

tesand measuremenwork

Pressure and temperature measuremenin refrigerancircui

♦ The high pressure gauge allows the pressure (and tempera‐

ture) to be measured with the air conditioning system switched

on irrespective of whether this is athe outleof the air condi‐

tioner compressor through the condenser up to the restriction

(restrictor or expansion valve).

♦ The low pressure gauge facilitates measuremenof the pres‐

sure (and temperature) thaspreads evenly from the restric‐

tion (restrictor or expansion valve) through the evaporator up

to the inleof the air conditioner compressor with the air con‐

ditioning system switched on.

Note

The relationship between pressure and temperature shown on

the pressure gauges is valid only where the refrigeranin the cir‐

cuiis liquid or vapour, bunowhen iis gas. In the gaseous state,

the temperature is approx. 10°C to 30°C higher than indicated on

the pressure gauge.

Evidence of refrigeranin a closed container

R1234yf refrigeranis presenin a closed container or refrigeran

circuiif the temperature indicated on the pressure gauge corre‐

126

Rep. gr.87 - Air conditioning system

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Air conditioning system Refrigerant circuit -> 1.6 Cleaning refrigerant circuit for Your Volkswagen Sharan VAN Second Generation (2010-2023)

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