Get Refrigerant circuit -> 1.5 Renewing components Guide for Volkswagen Scirocco SUV Third Generation (2008-2017)

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

♦ Quick-release coupling adapter -A- (you can also unscrew the

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adapter from your air conditioner service station and use it for

this test).

♦ Charge hose -A- (e.g. with a M12 x 1.5-6G thread, SAE J639

standard), depending on the thread of the quick-release cou‐

pling adapter (cut off), with a suitable adapter -B- (for connec‐

tion to the compressed air system used in your workshop or

to a pressure reducer for nitrogen)

♦ Combination fine filter element for compressed air system with

an oil, dirt and water separator (to ensure that the refrigerant

circuit is pressurised with compressed air that is clean, dry and

free of oil) for the leakage test with compressed air

♦ Manifold gauge with pressure reducer for nitrogen (maximum

reduced pressure: 15 bar) -1-, a full nitrogen gas cylinder -3-

and a charge hose -2- (e.g. with M12 x 1.5-6G thread in

accordance with SAE J639, to which a quick-release coupling

adapter for service connection is fitted) for leakage test with

nitrogen

– Perform pressure test ⇒ page 143 .

1.5

Renewing components

⇒ “1.5.1 General information about renewing components”, page

79

⇒ “1.5.2 Renewing leaking or damaged components of empty re‐

frigerant circuit (apart from air conditioner compressor and re‐

ceiver)”, page 81

⇒ “1.5.3 Renewing leaking or damaged components of charged

refrigerant circuit (apart from air conditioner compressor and re‐

ceiver)”, page 84

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85 .

⇒ “1.5.5 Renewing air conditioner compressor due to leaks or in‐

ternal damage”, page 87

⇒ “1.5.6 Renewing desiccant cartridge / receiver after cleaning

refrigerant circuit”, page 88

⇒ “1.5.7 Renewing receiver with no need to clean refrigerant cir‐

cuit”, page 90 .

⇒ “1.5.8 Renewing desiccant cartridge / desiccant bag with no

need to clean refrigerant circuit”, page 91

1.5.1

General information about renewing

components

The receiver or desiccant cartridge need not be renewed under

the following circumstances:

♦ The opened refrigerant circuit is sealed immediately with clean

plugs, e.g. from the engine bung set - VAS 6122- .

♦ After an accident in which there was no damage to the receiv‐

er.

♦ Repairs are performed quickly (not for longer than the normal

repair time).

♦ The vehicle is no more than 5 years old.

1. Refrigerant circuit

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The receiver or dryer cartridge should be renewed under the fol‐

lowing circumstances:

♦ The refrigerant circuit has been opened for an indeterminate

period (seepage leak).

♦ The receiver is damaged (e.g. in an accident).

♦ Repairs are performed over a longer time than the normal re‐

pair time.

♦ The refrigerant circuit was opened and the vehicle is more than

5 years old.

♦ The refrigerant circuit has been blown through with nitrogen.

♦ The refrigerant circuit has been flushed with R1234yf.

♦ The air conditioner compressor seizes.

•

All components of the refrigerant circuit that were submitted to

quality monitoring must be sealed (use the original sealing

caps from the replacement part).

•

Renew damaged or leaky components of the refrigerant circuit

⇒ page 79 .

All components of the refrigerant circuit that were submitted to

quality monitoring must be sealed (use the original sealing

caps from the replacement part).

•

The replacement air conditioner compressor, receiver, evap‐

orator and condenser were previously charged with nitrogen.

This filling is being gradually discontinued, or the pressure of

the nitrogen filling is so low that escaping gas is no longer

perceptible when the part is initially opened.

Where vehicles are fitted with an air conditioner compressor

without a magnetic clutch, the engine should be started only

when the refrigerant circuit has been fully assembled (since

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the air conditioner compressor will always run when the engine

is running) .

The air conditioner compressor with air conditioner compres‐

sor regulating valve - N280- (without air conditioning system

magnetic clutch - N25- ) is switched to internal lubrication in

the event of an empty refrigerant circuit, in which case only a

small amount of oil is pumped from the air conditioner com‐

pressor into the circuit.

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Rep. gr.87 - Air conditioning system

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Note

♦ The following replacement parts (air conditioner compressor,

receiver, evaporator and condenser) could be filled with nitro‐

gen gas, though this filling is not always guaranteed. There‐

fore, little or no pressure equalisation may be perceived when

the sealing plugs of the replacement part are unscrewed.

♦ Depending on the storage location and storage period, it is

possible on components filled with nitrogen ex-works that

barely any pressure equalisation - if at all - is perceptible and,

as such, nothing can be said about the leak-tightness of the

component. This means, for example, that the nitrogen gas

filling could escape through the shaft seal of a replacement air

conditioner compressor in the course of time, even though the

air conditioner compressor is leak-tight.

♦ Since spare parts are sometimes stored for long periods in

various places, there is a good chance that gas may escape

from some parts when first opened but not from others (even

of the same part number). Therefore, be careful when un‐

screwing the sealing plugs from the replacement part connec‐

tions and allow the nitrogen gas to escape slowly.

♦ One or 2 expansion valves and a receiver or desiccant con‐

tainer are installed in the refrigerant circuit ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit; System over‐

view - refrigerant circuit .

♦ Renew the desiccant cartridge or components with desiccant

bag (receiver) after cleaning the refrigerant circuit (flush with

R1234yf refrigerant

⇒ “1.6 Cleaning refrigerant circuit”, page 92 ). When doing

so, keep the circuit closed for as long as possible to keep the

ingress of moisture as low as possible.

♦ Seal open connections and pipes (to prevent absorption of

moisture).

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Note

Contaminated refrigerant oils are to be disposed of as used oil of

unknown origin (observe local regulations) ⇒ VW / Audi Service‐

Net .

1.5.2

Renewing leaking or damaged compo‐

nents of empty refrigerant circuit (apart

from air conditioner compressor and re‐

ceiver)

The refrigerant circuit was completely empty (e.g. larger leaks or

ruptured hose line)

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

1. Refrigerant circuit

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Note

♦ If there is just a small leak and the refrigerant only escaped in

small quantities (e.g. small leakage point), the amount of re‐

frigerant oil that escapes and the degree of moisture ingress

are not enough to impair the function of the air conditioning

system once the repair has been carried out.

♦ The measures marked with * should only be performed if leaks

are more pronounced (e.g. following an accident).

Electrical air conditioner compressor

– Remove defective component * ⇒ Heating, air conditioning;

Rep. gr. 87 ; Refrigerant circuit; System overview - refrigerant

circuit .

– Remove electrical air conditioning compressor and clean

(flush with R1234yf refrigerant) *

⇒ “1.6 Cleaning refrigerant circuit”, page 92 and ⇒ Heating,

air conditioning; Rep. gr. 87 ; Air conditioner compressor; Re‐

moving and installing electrical air conditioning compressor

(vehicle-specific workshop manual).

– Clean the refrigerant circuit (flush with R1234yf refrigerant)*

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

– Completely charge the air conditioner compressor or refriger‐

ant circuit with the requisite amount of oil

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85 and ⇒ Heating, air condi‐

tioning; Rep. gr. 00 ; Technical data (approved refrigerant oils

and fill capacities for refrigerant oil in vehicle-specific work‐

shop manual).

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Mechanical air conditioner compressor

– Remove defective component * ⇒ Heating, air conditioning;

Rep. gr. 87 ; Refrigerant circuit; System overview - refrigerant

circuit .

– Remove air conditioner compressor.* ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Air conditioner compressor .

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Rep. gr.87 - Air conditioning system

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

– Unscrew oil drain plug -B- / -D- from air conditioner compres‐

sor -A-.*

Note

♦ The design of the oil drain plug -B- / -D- and seal -C- / -E- may

vary (depending on the manufacturer of the air conditioner

compressor) ⇒ Heating, air conditioning; Rep. gr. 87 ; Air

conditioner compressor (vehicle-specific workshop manual).

♦ When installing the oil drain plug -B-/-D-, observe the corre‐

sponding torque specification (depending on the manufacturer

of the air conditioner compressor and the design of the oil drain

plug). Please note that the oil drain plug of air conditioner

compressors manufactured by Denso and Delphi is equipped

with an oil seal ⇒ Heating, Air conditioning; Rep. gr. 87 ; Air

conditioning compressor, Assembly overview - drive unit of air

conditioner compressor (currently valid specified torque:

30 Nm for “Denso” and 15 Nm for “Delphi” air conditioner com‐

pressor). The oil drain plug of air conditioner compressors

manufactured by “Sanden” and “Zexel- / Valeo” may be equip‐

ped with an O-ring or an oil seal (depending on the vehicle

equipment; currently valid specified torque: 10 Nm, respec‐

tively).

♦ On the Denso air conditioner compressor, for example, the oil

drain plug -D- has an oil seal -E-; renew ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Air conditioner compressor (vehicle-

specific workshop manual) and ⇒ Electronic parts catalogue .

♦ On the Sanden air conditioner compressor, for example, the

oil drain plug -B- has a seal -C-; renew ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Air conditioner compressor (vehicle-

specific workshop manual) and ⇒ Electronic parts catalogue .

♦ If a seal (oil seal or O-ring) fitted to the oil drain plug is not

available as a replacement part, the removed old part can be

reused (as an exception to the general rule of using new seals

only). The old seal, however, must always be checked for

damage prior to installation. If any damage or deformation is

detected on the old seal, it must be renewed with a commer‐

cially available new part.

♦ After filling the refrigerant circuit, check the installed oil drain

plug for leaks using e.g. an electronic leak detector.

♦ To speed up draining of the refrigerant oil, rotate the shaft of

the air conditioner compressor e.g. using the belt pulley or the

magnetic clutch pulley.

– Pour out old refrigerant oil from the air conditioner compressor

*

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85 (disposal ⇒ VW / Audi

ServiceNet ).

1. Refrigerant circuit

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All vehicles

Note

♦ Then pour new refrigerant oil in the air conditioner compressor

in a volume that equates to the refrigerant oil in the replace‐

ment compressor * ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data; refrigerant oil .

♦ Different refrigerant oil and volumes for different air condition‐

er compressors ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data; refrigerant oil .

♦ To ensure proper lubrication of the air conditioner compressor

when it runs for the first time, the air conditioner compressor

3

must be filled with at least 40 cm of refrigerant oil; the re‐

mainder can be poured e.g. into the new reservoir or receiver

or a refrigerant line ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data; refrigerant oil .

♦ If dirt enters the air conditioner compressor whilst the refrig‐

erant circuit is open (e.g. after an accident), the air conditioner

compressor is to be renewed ⇒ Heating, air conditioning; Rep.

gr. 87 ; Air conditioner compressor .

♦ Clean the refrigerant circuit (flush with R1234yf refrigerant) *

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

– Renew desiccant cartridge and receiver ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Refrigerant circuit; System overview -

refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and refill

⇒ page 129 .

1.5.3

Renewing leaking or damaged compo‐

nents of charged refrigerant circuit

(apart from air conditioner compressor

and receiver)

There is still refrigerant in the refrigerant circuit (e.g. the leak is

small)

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

– Drain refrigerant circuit ⇒ page 129 .

– Remove the defective part, blow through with compressed air

and collect any escaping refrigerant oil.

3

–

The refrigerant oil that is blown out (plus 20 cm for the evap‐

3

orator, plus 10 cm for the condenser, refrigerant lines and

refrigerant hoses) should be poured into the new component

as fresh refrigerant oil.

Note

Dispose of old refrigerant oil (observing local regulations) ⇒ VW /

Audi ServiceNet .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

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1.5.4

Renewing air conditioner compressor

with no need to clean refrigerant circuit

Note

Clean the refrigerant circuit. In other words, flush with R1234yf

refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

For example with external damage from an accident

– Drain refrigerant circuit

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

– Remove air conditioner compressor ⇒ Heating, air condition‐

ing; Rep. gr. 87 ; Air conditioner compressor .

Electrical air conditioner compressor

– Flush the defective electrical air conditioning compressor to

remove the refrigerant oil (make a note of the volume of re‐

frigerant oil flushed out)

⇒ “2.11 Cleaning electrical air conditioning compressor”, page

155 .

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Note

♦ If the volume of refrigerant oil flushed out of the defective air

conditioner compressor is more than 75% of that in the re‐

placement air conditioner compressor, do not flush the re‐

placement air conditioner compressor (a residual amount

always remains in the air conditioner compressor, which

means that the amount of refrigerant oil in the refrigerant circuit

is negligible).

♦ If less than 75% of the specified amount of refrigerant oil is

flushed out of the defective air conditioner compressor, the

remaining amount is still in the components of the refrigerant

circuit. To prevent the system from being overfilled with refrig‐

erant oil, the refrigerant circuit or the electrical air conditioning

compressor is to be flushed.

– Flush the refrigerant circuit or new electrical air conditioning

compressor to remove the refrigerant oil

⇒ “1.6 Cleaning refrigerant circuit”, page 92 and

⇒ “2.11 Cleaning electrical air conditioning compressor”, page

155 .

– Dispose of refrigerant oil flushed out of defective and new air

conditioner compressor / refrigerant circuit ⇒ VW / Audi Serv‐

iceNet (observe local regulations).

Note

The design of the electrical air conditioning compressor is such

that flushing is a requisite to remove the refrigerant oil (the refrig‐

erant oil cannot be poured out as is the case with mechanical air

conditioning compressors with oil drain plug)

⇒ “1.5.2 Renewing leaking or damaged components of empty re‐

frigerant circuit (apart from air conditioner compressor and re‐

ceiver)”, page 81 .

1. Refrigerant circuit

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– Only fill the replacement air conditioner compressor with fresh

refrigerant oil equivalent to volume of oil that was flushed out

(from the defective air conditioner compressor).

Note

3

♦

If for instance 70 cm refrigerant oil was poured out of the de‐

3

fective air conditioner compressor, and 140 cm oil was pour‐

ed out of the replacement air conditioner compressor (a small

quantity of refrigerant oil remains in the air conditioner com‐

pressor and potentially in the air conditioner service station ).

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The air conditioner compressor to be installed must be filled

3

in this instance with 70 cm of refrigerant oil (the refrigerant oil

flushed out of the replacement air conditioner compressor

must not be used as it may have been contaminated in the air

conditioner service station ).

♦ Different refrigerant oils and volumes for different air condi‐

tioner compressors ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data .

♦ If quite a large amount of refrigerant oil was flushed out of the

defective air conditioner compressor (more than approx.

3

40 cm ), the remaining refrigerant oil can also be poured in

the evaporator, a refrigerant line or the reservoir/receiver/inner

heat exchanger ⇒ Heating, air conditioning; Rep. gr. 87 ; Re‐

frigerant circuit; System overview - refrigerant circuit , ⇒

Heating, air conditioning; Rep. gr. 00 ; Technical data .

Mechanical air conditioner compressor

– Remove oil drain plug from air conditioner compressor ⇒

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

System overview - refrigerant circuit .

Note

Different versions of oil drain plug and corresponding seal (either

a seal or an O-ring may be installed, renew)

⇒ “1.5.2 Renewing leaking or damaged components of empty re‐

frigerant circuit (apart from air conditioner compressor and re‐

ceiver)”, page 81 and ⇒ Electronic parts catalogue .

– To speed up draining of the refrigerant oil, rotate the shaft of

the air conditioner compressor using e.g. the magnetic clutch

pulley.

– Pour out old refrigerant oil from the air conditioner compressor

and dispose ⇒ VW / Audi-ServiceNet (observe local regula‐

tions).

– Remove oil drain screw from replacement air conditioner com‐

pressor, pour out refrigerant oil and replace it with only the

quantity of fresh refrigerant oil equal to the amount of refrig‐

erant oil poured out of the defective air conditioner compressor

⇒ “1.5.2 Renewing leaking or damaged components of empty

refrigerant circuit (apart from air conditioner compressor and

receiver)”, page 81 .

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Note

3

♦

If for instance 50 cm refrigerant oil was poured out of the de‐

3

fective air conditioner compressor, and 100 cm oil was pour‐

ed out of the replacement air conditioner compressor (a small

quantity of refrigerant oil remains in the air conditioner com‐

3

pressor), pour 50 cm refrigerant oil into the replacement air

conditioner compressor (the refrigerant oil previously poured

from the air conditioner compressor spare part may be used).

♦ Different refrigerant oils and volumes for different air condi‐

tioner compressors ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data .

♦ If quite a large amount of refrigerant oil was poured out of the

defective air conditioner compressor (more than approx. 50

3

cm ), the remaining refrigerant oil can also be poured in the

evaporator or reservoir/receiver/inner heat exchanger ⇒ Heat‐

ing, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System

overview - refrigerant circuit .

All

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– Renew restrictor (only if installed in this refrigerant circuit).

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1.5.5

Renewing air conditioner compressor

due to leaks or internal damage

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

Vehicles with high-voltage system (hybrid vehicles)

– Observe the risk category of the high-voltage system ⇒ Rep.

gr. 00 ; Risk category of the high-voltage system .

– Observe safety precautions when working on the high-voltage

system

⇒ “1.5 Safety measures for working on vehicles with high-volt‐

age system”, page 3 .

– Observe safety precautions when working in the vicinity of

high-voltage components

⇒ “1.6 Safety precautions when working in the vicinity of high-

voltage components”, page 4 .

All vehicles

Renew air conditioner compressor e.g. owing to noise from the

air conditioner compressor or lack of performance.

– Drain refrigerant circuit ⇒ page 129 .

– Remove air conditioner compressor ⇒ Heating, air condition‐

ing; Rep. gr. 87 ; Air conditioner compressor .

– Clean refrigerant circuit (flush with R1234yf refrigerant)

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

1. Refrigerant circuit

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♦ In the event of internal damage (to the air conditioner com‐

pressor), check the refrigerant hoses and condenser. If con‐

taminated by swarf, for example, clean ^lt^khe refrigerant hoses

and condenser (flush with R1234yf refrigerant

⇒ “1.6 Cleaning refrigerant circuit”, page 92 ); renew refrig‐

erant hoses if necessary.

♦ On certain vehicles (e.g. vehicles with 2 evaporators), the vol‐

ume of refrigerant oil in the refrigerant circuit may be greater

than the volume in the replacement air conditioner compres‐

sor. Replenish the refrigerant circuit on these vehicles with the

amount of refrigerant oil necessary ⇒ Heating, air condition‐

ing; Rep. gr. 00 ; Technical data (vehicle-specific workshop

manual).

♦ In the event of a fault in the electronics of an electrical air con‐

ditioning compressor (e.g. control unit for air conditioning com‐

pressor - J842- defective), the refrigerant circuit need not be

flushed. In this case, the air conditioner compressor is to be

renewed without there being a requirement to clean the re‐

frigerant circuit

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85

– Renew desiccant bag/desiccant cartridge (reservoir/receiver)

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

System overview - refrigerant circuit .

– Check expansion valve for contamination or corrosion, renew

if necessary ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐

erant circuit; System overview - refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1.5.6

Renewing desiccant cartridge / receiver

after cleaning refrigerant circuit

Note

Installed in the receiver is usually a desiccant cartridge or desic‐

cant bag (depending on the layout of the refrigerant circuit) ⇒

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

overview - refrigerant circuit

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

Note

Clean the refrigerant circuit. In other words, flush with R1234yf

refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

For example due to moisture ingress (the refrigerant circuit was

open for too long) or contamination

– Drain refrigerant circuit ⇒ page 129 .

– Remove air conditioner compressor ⇒ Heating, air condition‐

ing; Rep. gr. 87 ; Air conditioner compressor .

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– Rectify cause of fault ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerant circuit; System overview - refrigerant circuit .

– Clean refrigerant circuit (flush with R1234yf refrigerant)

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

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Electrical air conditioner compressor

– Flush air conditioner compressor of old refrigerant oil

⇒ “2.11 Cleaning electrical air conditioning compressor”, page

155 .

Mechanical air conditioner compressor

– Remove oil drain plug from air conditioner compressor ⇒

Heating, air conditioning; Rep. gr. 87 ; Air conditioner com‐

pressor .

Note

Different versions of oil drain plug and corresponding seal, renew

⇒ “1.5.2 Renewing leaking or damaged components of empty re‐

frigerant circuit (apart from air conditioner compressor and re‐

ceiver)”, page 81 , ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerant circuit; System overview - refrigerant circuit (vehicle-

specific workshop manual) and ⇒ Electronic parts catalogue .

– To speed up draining of the refrigerant oil, rotate the shaft of

the air conditioner compressor e.g. using the belt pulley or the

magnetic clutch pulley ⇒ Heating, air conditioning; Rep. gr.

87 ; Air conditioner compressor .

– Pour out old refrigerant oil from air conditioner compressor

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85 .

Note

Dispose of old refrigerant oil (observing local regulations) ⇒ VW /

Audi ServiceNet .

All air conditioner compressors

– Check expansion valve for contamination or corrosion, renew

if necessary ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐

erant circuit; System overview - refrigerant circuit .

– Then fill the air conditioner compressor with new refrigerant oil

by the same amount of refrigerant oil filled in the replacement

air conditioner compressor (or by the specified amount of re‐

frigerant oil if the vehicle is fitted with 2 evaporators) ⇒

Heating, air conditioning; Rep. gr. 00 ; Technical data; Re‐

frigerant oil .

1. Refrigerant circuit

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Note

♦ Different refrigerant oils and volumes for different air condi‐

tioner compressors ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data (vehicle-specific workshop manual).

♦ To ensure proper lubrication of the air conditioner compressor

when it runs for the first time, the air conditioner compressor

3

must be filled with at least 40 cm of refrigerant oil; the re‐

mainder can be poured e.g. into a refrigerant line or the new

reservoir/receiver/inner heat exchanger

⇒ “1.5.1 General information about renewing components”,

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

data .

♦ If dirt enters the air conditioner compressor while the refriger‐

ant circuit is open (e.g. after an accident), the refrigerant circuit

must be cleaned and the air conditioner compressor renewed

⇒ “1.6 Cleaning refrigerant circuit”, page 92 and ⇒ Heating,

air conditioning; Rep. gr. 87 ; Air conditioner compressor .

♦ On vehicles with 2 evaporators, the volume of refrigerant oil in

the refrigerant circuit may be greater than the volume in the

replacement air conditioner compressor. Replenish the refrig‐

erant circuit with the amount of refrigerant oil necessary ⇒

Heating, air conditioning; Rep. gr. 00 ; Technical data (vehicle-

specific workshop manual).

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– Renew desiccant bag/desiccant cartridge (receiver) ⇒ Heat‐

ing, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System

overview - refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1.5.7

Renewing receiver with no need to clean

refrigerant circuit

Note

Installed in the receiver is usually a desiccant cartridge or desic‐

cant bag (depending on the layout of the refrigerant circuit) ⇒

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

overview - refrigerant circuit

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

Note

Clean the refrigerant circuit. In other words, flush with R1234yf

refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

♦ For example, refrigerant has leaked out but no dirt has entered

the circuit.

♦ If the gas analysis shows that contaminated refrigerant was in

the circuit but there appears to be no problem with the function

of the air conditioning system

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

– Drain refrigerant circuit ⇒ page 129 .

90

Rep. gr.87 - Air conditioning system

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

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

– Remove receiver ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerant circuit; System overview - refrigerant circuit .

– Remove dirt from receiver.

lk

– Weigh removed receiver.

– Fill enough refrigerant oil into the new receiver so that it has

the same weight as the item that was removed.

– Install new receiver ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerant circuit; System overview - refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1.5.8

Renewing desiccant cartridge / desic‐

cant bag with no need to clean refriger‐

ant circuit

Note

Desiccant cartridges or desiccant bags are usually installed de‐

pending on the layout of the refrigerant circuit ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit; System overview -

refrigerant circuit

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

Note

Clean the refrigerant circuit. In other words, flush with R1234yf

refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

♦ For example, refrigerant has leaked out but no dirt has entered

the circuit.

♦ If the gas analysis shows that contaminated refrigerant was in

the circuit but there appears to be no problem with the function

of the air conditioning system

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

– Drain refrigerant circuit ⇒ page 129 .

– Renew desiccant cartridge/desiccant bag ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Refrigerant circuit; System overview -

refrigerant circuit (vehicle-specific workshop manual).

Note

If the desiccant cartridge/desiccant bag is permanently installed

in a component (e.g. in the receiver on the condenser) and cannot

be renewed individually, renew the receiver or condenser ⇒

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

overview - refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1. Refrigerant circuit

91

Refrigerant circuit -> 1.5 Renewing components for Your Volkswagen Scirocco SUV Third Generation (2008-2017)

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