Get Air conditioning system -> 1.6.8 Adapters for setting up flushing circuits Guide for Volkswagen Touran 4 Door Second Generation (2015-2022)

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

13 - Charging hose of flushing device for refrigerant circuits

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

ameter) to inlet of flushing device for refrigerant circuits.

14 - Flushing device for refrigerant circuits

❑ Different versions and different design of flushing devices for refrigerant circuits ⇒ Electronic parts cata‐

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

❑ With filter, sight glass, safety valve, heating, refrigerant tank, etc. (depending on version).

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

circuits, there may be a non-return valve installed at the outlet of the flushing device for refrigerant circuits

(to assure the correct direction of refrigerant flow 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 at the outlet to the air conditioner service station

lk

Note

♦ To ensure that the 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) at the

outlet of 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 refrigerant

circuits. To ensure that both

components can be connected

to each other, an additional

adapter may be necessary ⇒

Electronic parts catalogue .

♦ Since refrigerant is only drawn in

by the air conditioner service sta‐

tion at a low flow speed, the low

pressure service coupling can be

used here.

15 - Refrigerant hose of air conditioner service station

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

the flushing device for refrigerant circuits.

16 - Adapter to seal outlet to second evaporator

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

❑ From adapter case VW/Audi passenger vehicle set

1. Refrigerant circuit

101

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

17 - Adapter to seal outlet to second evaporator

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

❑ From adapter case VW/Audi passenger vehicle set

18 - Connection of low pressure side in refrigerant circuit to 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 refrigerant circuit to 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 set

21 - Second evaporator

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

1.6.5

Principle circuit diagrams for cleaning

(flushing circuits) - refrigerant circuit with

restrictor and receiver (without high-volt‐

age system)

Note

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

reservoir must be removed. The lines that were detached to

remove the restrictor are reinstalled. The line connections to

the removed reservoir are joined together with 2 adapters and

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

ger vehicles ).

♦ This layout with restrictor and refrigerant circuit reservoir is

currently not used at Volkswagen/Audi.

♦ The arrows in the following illustrations show the direction of

refrigerant flow during flushing (during flushing, the refrigerant

flows against the 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 refrigerant circuit to the air conditioner

compressor).

♦ Depending on the design of the air conditioner service station

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

erant circuit and the air conditioner service station (to assure

the correct direction of refrigerant flow during flushing).

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

vehicles have a 5/8 -18 UNF thread. To ensure that the 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

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

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)

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❑ If an air conditioner

service station without

flushing program is

used, the sequence has

to be carried out man‐

ually (evacuate, flush

4 times with at least 3 kg

of refrigerant each time

and extract refrigerant

again, evacuate).

2 - Refrigerant hose 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 refrigerant circuit

(larger diameter)

3 - Adapter for connection to

low pressure side in refrigerant

circuit

❑ 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 refrigerant hose -2- and adapter -3- is adapter - VAS 6338/48- .

❑ From adapter case VW/Audi passenger vehicle set

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 that both components

can be connected to each other,

an additional adapter is required

⇒ Electronic parts catalogue .

♦ To attain the fastest flow speed

possible, the service coupling is

removed from the charge hose

for purposes of flushing (bottle-

necks are present in the service

coupling that would significantly

reduce the flow speed).

1. Refrigerant circuit

103

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

4 - Connection of low pressure side in refrigerant circuit

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

❑ On refrigerant line 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 refrigerant line 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 set

7 - Charge hose for refrigerant

❑ 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 set

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 ; Refrigerant circuit; System overview - re‐

frigerant circuit (vehicle-specific workshop manual).

12 - Threaded connection in refrigerant line

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

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

13 - Condenser

14 - Connection for high pressure side on refrigerant circuit

❑ 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 refrigerant circuit

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

❑ From adapter case VW/Audi passenger vehicle set

16 - Charging hose of flushing device for refrigerant circuits

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

ameter) to inlet of flushing device for refrigerant circuits.

17 - Flushing device for refrigerant circuits

❑ Different versions and different design of flushing devices for refrigerant circuits ⇒ Electronic parts cata‐

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

❑ With filter, sight glass, safety valve, heating, refrigerant tank, etc. (depending on version).

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

circuits, there may be a non-return valve installed at the outlet of the flushing device for refrigerant circuits

(to assure the correct direction of refrigerant flow during flushing).

❑ Depending on the layout of the flushing device for refrigerant circuits, there may be a connection for a

service coupling for refrigerant circuits at the outlet and possibly the inlet of the flushing device (instead

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

flushing device, this valve must be 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 present at

the inlet of the flushing device, the inlet must be converted in such a way that the refrigerant hose coming

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

device represent a bottle-neck that can hinder the flow of refrigerant out of the vehicle into the flushing

device and thereby affect the flushing process).

104

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

18 - Refrigerant hose of air conditioner service station

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

the flushing device for refrigerant circuits.

1.6.6

Principle circuit diagrams for cleaning

(flushing circuits) - vehicles with high-

voltage system (without auxiliary air

conditioning functions)

Note

♦ The refrigerant circuit is cleaned in 2 flushing cycles (first the

section with the evaporator in the front heating and air condi‐

tioning unit and then the section with the heat exchanger for

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

ule) ⇒ page 105

♦ On vehicles with 2 evaporators or an evaporator and heat ex‐

changer, separate the circuit to the second evaporator or the

heat exchanger from the circuit of the first evaporator via hand

shut-off valves, and flush it in a separate work step

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

Refrigerant circuit; System overview - refrigerant circuit (vehi‐

cle-specific workshop manual).

♦ The layout of the various flushing circuits for these vehicles is

similar to that on a vehicle with 2 evaporators.

lk

1.6.7

Principle circuit diagrams for cleaning

(flushing circuits) - vehicles with high-

voltage system (with auxiliary air condi‐

tioning functions, e.g. heat pump mode)

Note

♦ The refrigerant circuit is cleaned in several flushing cycles

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

Refrigerant circuit (cleaning refrigerant circuit of air condition‐

ing system).

♦ For flushing, the circuit is split into several sections and then

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

formed by means of the integrated electric valves that are

switched electrically and the manual shut-off valves that are

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

Refrigerant circuit (cleaning refrigerant circuit of air condition‐

ing system).

♦ The layout of the various flushing circuits for these vehicles is

described in the relevant vehicle-specific workshop manual ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit

(cleaning refrigerant circuit of air conditioning system

⇒ “1.6.4 Principle circuit diagrams for cleaning (flushing cir‐

cuits) - refrigerant circuit with expansion valve and receiver”,

page 97 ).

1.6.8

Adapters for setting up flushing circuits

♦ The following table contains the various adapters that are nec‐

essary to connect the air conditioner service station to the

refrigerant circuit for purposes of flushing and to bridge the

1. Refrigerant circuit

105

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

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 that the 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 (short ver‐

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 refrigerant circuit is not going 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, different connection and sealing

methods may have been used for the refrigerant circuit ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit;

System overview - refrigerant circuit (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 circuit - passenger cars ⇒ page 106 or com‐

mercial vehicles ⇒ page 107 .

Passenger cars

Assembling flushing circuit

Arteon 2018 ▶

Atlas 2017 ▶

CC 2012 ▶

e-Golf 2014 ▶, e-Golf 2014 ▶ with heat pump

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 Cabriolet 2012 ▶

106

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Assembling flushing circuit

Golf SV 2015 ▶

Jetta 2015 ▶

Jetta 2018 ▶

Passat 2015 ▶, Passat Estate 2015 ▶

Passat 2018 ▶, Passat Estate 2018 ▶

Passat GTE

Polo 2014 ▶

Polo 2018 ▶

⇒ page 110

⇒ page 118

⇒ page 113

⇒ page 111

⇒ page 114

⇒ page 113

⇒ page 115

Scirocco 2015 ▶

Sharan 2016 ▶

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The Beetle 2017 ▶, The Beetle Cabriolet 2017 ▶

The Beetle 2018 ▶, The Beetle Cabriolet 2018 ▶

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 refrigerant

R134a; Rep. gr. 00 ; Cleaning refrigerant circuit, commercial ve‐

hicles .

Assembling flushing circuit

Caddy 2016 ▶

Crafter 2017 or MAN TGE ▶

Transporter 2016 ▶

⇒ page 119

⇒ page 120

Passenger cars

Arteon 2018 ▶

Vehicle

Adapters required for refrigerant pipes Adapters required for re‐

Miscellaneous

to air conditioner compressor

frigerant pipes to receiver

Arteon 2018 ▶ ♦ Low-pressure side adapter - VAS

6338/12-

Remo–ve desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led out expansion valve

⇒ page 96 )

♦ High pressure side adapter - VAS

6338/3-

After flu–shing, install a

new desiccant bag/car‐

tridge.

♦ Adapter - VAS 6338/48- for air con‐

ditioner service station

After flu–shing, install a

new expansion valve.

1. Refrigerant circuit

107

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

Atlas 2017 ▶

Vehicle

Adapters required for refrigerant pipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigerant pipes to receiver

Atlas 2017 ▶ ♦ Low-pressure side adapter - VAS

6338/12-

Remo–ve desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led out expansion valve

⇒ page 96 )

♦

High pressure side adapter - VAS

After flu–shing, install a

new desiccant bag/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 refrigerant lines to

the second evaporator

must be loosened suf‐

ficiently so that the

adapter can be fitted

without deforming the

refrigerant lines.

♦ Low-pressure line for

2nd evaporator, seal‐

ing adapter - VAS

6338/63- for front re‐

frigerant circuit.

♦ High-pressure line for

2nd evaporator, seal‐

ing adapter - VAS

6338/5- for front refrig‐

erant circuit.

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

108

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

CC 2012 ▶

Vehicle Adapters required for refrigerant pipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigerant pipes to receiver

CC 2012 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air conditioner

service station and adapter - VAS

6338/48- .

Remo–ve desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/18- in place of ex‐

pansion valve (or a dril‐

led out expansion valve

⇒ page 96 )

After flu–shing, install a

new desiccant bag/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 refrigerant circuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

e-Golf 2014 ▶, e-Golf 2014 ▶ with heat pump

Vehicle

Adapters required for refriger‐ Adapters required for re‐

Miscellaneous

ant pipes to air conditioner frigerant pipes 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–desiccant car‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led out expansion 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

heat pump

♦ 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‐

ant pipes.

Start “B–asic setting” in

⇒ Vehicle diagnostic

tester, and start the

function “Charge refrig‐

erant circuit”.

Join tw–o adapters -

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

♦ High pressure side adapter

- VAS 6338/3-

- VAS 6338/31- togeth‐

er.

trical valves in the re‐

frigerant circuit.

♦ 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. Refrigerant circuit

109

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

lk

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ 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

ant pipes to air conditioner frigerant pipes to receiver

compressor

Golf 2013 ▶, Golf 2015 ♦ Low pressure side adapter

Remo–ve desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led out expansion 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 desiccant bag/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 desiccant bag /

cartridge is installed,

leave the condenser/

receiver in situ and

flush the refrigerant cir‐

cuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

110

Rep. gr.87 - Air conditioning system

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Golf GTE, Passat GTE

Vehicle

Adapters required for refriger‐ Adapters required for re‐

ant pipes to air conditioner frigerant pipes to receiver

compressor

Miscellaneous

Golf GTE, Passat

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 out expansion 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‐

cant bag or cartridge

⇒ page 112

Remove–restrictor in re‐

frigerant line to heat ex‐

changer for high-volt‐

age battery, and drill it

out (see notes below)

⇒ page 112 .

Remo–ve desiccant

bag/cartridge and seal

receiver.

After flu–shing, install a

new desiccant bag/car‐

tridge.

lk

♦ With an electric air con‐

ditioning compressor,

the refrigerant oil is to

be removed in the di‐

rection of flow by flush‐

ing (flushing in the op‐

posite direction of flow

is not possible due to

the integrated valves).

♦

The air conditioner

compressor must be

positioned for flushing

so that the connection

for the refrigerant line

on the high pressure

side is at the lowest

point possible.

1. Refrigerant circuit

111

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Note

♦ In the Golf GTE and Passat GTE, the refrigerant circuit is

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

lk

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

is closed. This will cause the refrigerant circuit with the evap‐

orator in the heater and air conditioning unit to 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

refrigerant circuit with the evaporator in the heat exchanger for

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

ditioning system; Rep. gr. 87 ; Refrigerant circuit (vehicle-

specific workshop manual).

♦ The illustration shows a refrigerant line -A- with a permanently

installed restrictor -B- (without strainer). This refrigerant line

must be drilled open with a suitable 5 mm drill bit (remove the

restrictor if it is removable), and it must be cleaned before it is

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

refrigerant line must be renewed ⇒ Electronic parts cata‐

logue .

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

approx. 0.7 mm. Depending on the refrigerant line version, this

restrictor is permanently installed or it can be removed. For the

removable version a strainer may be fitted to prevent the 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‐

cant cartridge that is currently not always available as a re‐

placement part. Therefore, it may 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 ; Refrigerant cir‐

cuit (vehicle-specific workshop manual).

♦ On vehicles having condensers with an integrated receiver/

desiccant cartridge which cannot be renewed separately or

which is not available as a replacement part, the condenser

must be renewed after flushing (with installed desiccant car‐

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

Refrigerant circuit (vehicle-specific workshop manual) and ⇒

Electronic parts catalogue .

112

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Golf Cabriolet 2012 ▶, Scirocco 2015 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

ant pipes to air conditioner frigerant pipes to receiver

compressor

Miscellaneous

Golf Cabriolet 2012 ▶, ♦ 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 out expansion 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‐

cant bag or cartridge

Remo–ve desiccant

bag/cartridge and seal

receiver.

After flu–shing, install a

new desiccant bag/car‐

tridge.

lk

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

Passat 2015 ▶, Passat Estate 2015 ▶, Passat 2018 ▶, Passat

Estate 2018 ▶

Note

In the Passat 2015 and Passat Estate 2015 with bi-turbo engine,

the refrigerant circuit is not flushed. In these vehicles, it would

require too much effort to 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 inlet side but not on the outlet

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

sor.

Vehicle

Adapters required for refriger‐ Adapters required for re‐

Miscellaneous

ant pipes to air conditioner frigerant pipes to receiver

compressor

Passat 2015 ▶, Pas‐ ♦ Low pressure side adapter

Remo–ve desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/18- or adapter -

VAS 6338/38- (or a dril‐

led out expansion valve

⇒ page 96 ) in place of

expansion valve

sat Estate 2015 ▶,

Passat 2018 ▶, Pas‐

sat Estate 2018 ▶

- VAS 6338/12- connected

to air conditioner service

station and adapter - VAS

6338/48- .

After flu–shing, install a

new desiccant bag/car‐

tridge.

♦ High pressure side adapter

- VAS 6338/3-

After flu–shing, install a

new expansion valve.

1. Refrigerant circuit

113

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

Polo 2014 ►

Vehicle

Adapters required for refrigerant pipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigerant pipes to receiver

Polo 2014 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air conditioner

service station and adapter - VAS

6338/48- .

Remove–desiccant car‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/39- in place of ex‐

pansion valve (or a dril‐

led out expansion 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-

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Polo 2018 ▶

Vehicle

Adapters required for refrigerant pipes to Adapters required for re‐

Miscellaneous

air conditioner compressor

frigerant pipes to receiver

Polo 2018 ▶ ♦ Low-pressure side adapter - VAS

6338/12-

Remo–ve desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led out expansion valve

⇒ page 96 )

♦

High pressure side adapter - VAS

6338/3-

After flu–shing, install a

new desiccant bag/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‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

114

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Sharan 2016 ▶

Vehicle

Adapters required for refrigerant pipes Adapters required for re‐

Miscellaneous

to air conditioner compressor

frigerant pipes to receiver

Sharan 2016 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air condi‐

tioner service station and adapter -

VAS 6338/48- .

Remove–desiccant car‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/18- in place of

front expansion valve

(or a drilled-out expan‐

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-out expan‐

sion valve ⇒ page 96 )

♦ High-pressure line for

second evaporator

adapter - VAS 6338/4-

After flu–shing, install a

new expansion valve.

♦ The refrigerant lines to

the second evaporator

must be loosened suf‐

ficiently so that the

adapter can be fitted

without deforming the

refrigerant lines.

♦ Sealing adapter - VAS

6338/5- for front refrig‐

erant circuit.

♦ Sealing adapter - VAS

6338/11- for front re‐

frigerant circuit.

lk

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

1. Refrigerant circuit

115

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lk

Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Tiguan 2016 ▶, Tiguan MEX 2017 ▶

Vehicle

Adapters required for refriger‐ Adapters required for re‐

ant pipes to air conditioner frigerant pipes 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 desiccant

bag/cartridge and seal

receiver.

Install a–dapter - VAS

6338/38- in place of ex‐

pansion valve (or a dril‐

led out expansion valve

⇒ page 96 )

After flu–shing, install a

new desiccant bag/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 desiccant bag /

cartridge is installed,

leave the condenser/

receiver in situ and

flush the refrigerant cir‐

cuit.

After flu–shing, install a

new receiver.

Note

On vehicles having condensers with an integrated receiver/des‐

iccant cartridge which cannot be renewed separately or which is

not available as a separate replacement part, the condenser must

be renewed after flushing (together with integrated desiccant car‐

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

circuit; System overview - refrigerant circuit and ⇒ Electronic

parts catalogue .

Touareg 2015 ▶

Vehicle

Adapters required for refrigerant

Adapters required for re‐

Miscellaneous

pipes to air conditioner compressor frigerant pipes to receiver

Touareg 2015 ▶ ♦ Low pressure side adapter - VAS

6338/12- connected to air condi‐

tioner service station and adapter

- VAS 6338/48- .

Remove–desiccant car‐

tridge and seal receiv‐

er.

Install a–dapter - VAS

6338/17- or adapter -

VAS 6338/33- in place

of front and rear expan‐

sion valves (or a drilled

out expansion 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 front refrig‐

erant circuit.

♦ Sealing adapter - VAS

6338/11- for front re‐

frigerant circuit.

116

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 1.6.8 Adapters for setting up flushing circuits for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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