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– Attach a label close to the service connections that shows that

the refrigerant circuit has been injected with a UV leak detec‐

tion additive.

– Remove any remains of UV leak detection additive from the

service connection e.g. with absorbent paper, and clean the

area with cleaning agent - VAS 6201/3- .

– Seal the service connection with a cap.

– Bring the air conditioning system into operation.

– Run the air conditioning system for at least 60 minutes with

the air conditioner compressor switched on.

– Search for leaks in the refrigerant circuit using a UV lamp

⇒ page 75 .

Searching for leaks in refrigerant circuit using a UV lamp

CAUTION

Risk of eyes being dazzled by UV light.

– Wear protective goggles.

– Never glare into the UV lamp.

– Never point a UV lamp at another person.

– On vehicles with high-voltage system, switch off “stationary air

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conditioning” function (deactivate)⇒ Owner's Manual and ⇒

Operating instructions of infotainment/MMI .

– Switch off ignition.

1. Refrigerant circuit

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Note

♦ The air conditioning system must be operated for at least

60 minutes to ensure that the injected leak detecting additive

is distributed throughout the entire refrigerant circuit (air con‐

ditioner compressor must run). The leak may become visible

under UV light after a short period, but this depends on the

size of the leak.

♦ Depending on the size and location of the leak, it can take

several days until sufficient refrigerant oil with UV leak detec‐

tion additive has leaked out and the leak can be easily identi‐

fied as such.

♦ In the event of leaks at the evaporator, the additive may be

washed out with the condensate and emerge via the conden‐

sate drain. As the evaporator is not accessible on the majority

of models without a great amount of work, a check of the con‐

densed water drain point can indicate a leaking evaporator.

This does however require the additive to have been in the

refrigerant circuit for a lengthy period (several days).

♦ The protective eye wear is not only required to protect the

eyes. It also amplifies the illumination of the UV leak detection

additive under the UV lamp.

♦ Depending on how easy it is to reach various components in

the refrigerant circuit, it may be necessary to remove certain

parts from the vehicle (e.g. bumper or air filter).

♦ Only a small amount of refrigerant oil reaches certain areas of

the refrigerant circuit during operation of the air conditioning

system (e.g. a cap fitted at the top of a receiver installed on

the condenser). If there is a leak in these areas, it may take

quite some time before a sufficient quantity of refrigerant with

refrigerant oil and additive escapes at this point and can be lit

up under UV light showing where the leak is. At these points,

therefore, it may be more pertinent to search for a leak using

an electronic leak detection device

⇒ “1.4.2 Searching for leaks in refrigerant circuits using an

electronic leak detector”, page 69 .

– Position the vehicle in a darker area of the workshop (in day‐

light or under strong lighting the effect of the UV lamp is greatly

reduced).

– Check accessibility to various components of the refrigerant

circuit and remove parts in the vicinity of the refrigerant circuit

that obstruct the view of the refrigerant circuit components

(e.g. noise insulation and bumper).

– Protect eyes with safety goggles.

– Connect UV lamp to a 12 V battery (vehicle battery). Ensure

that the polarity of the connections is correct.

– Switch on the UV lamp and light up the components in the

refrigerant circuit. Positions at which refrigerant - along with

refrigerant oil and leak detection additive - can leak out fluo‐

resce (light-up) under UV light.

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1.4.4

Detecting leaks in a vacuum test using

air conditioner service station , or in a

pressure test

All vehicles

CAUTION

Risk of freezing injury caused by escaping pressurised refrig‐

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erant.

There is a risk of injury to the skin and parts of the body due to

freezing.

– Wear protective gloves.

– Wear protective goggles.

– Extract refrigerant and open the refrigerant circuit immedi‐

ately afterwards.

– If more than 10 minutes have passed since the refrigerant

was extracted, repeat the extraction process before opening

the refrigerant circuit. Pressure could build up in the refrig‐

erant circuit from continued evaporation.

– Switch off ignition.

♦ Detecting leaks in a vacuum test using air conditioner service

station , or in a pressure test

⇒ “2.5 Evacuating refrigerant circuit”, page 140

Note

♦ Smaller leaks in the refrigerant circuit (less than 100 g refrig‐

erant loss per year) cannot usually be found by means of the

vacuum test or pressure test. The amount of air entering the

system or the nitrogen-air escaping it is too low to detect the

faulty area through noise.

♦ It is also not always possible to detect leaks in the refrigerant

circuit with more than 100 g refrigerant loss per year by means

of the vacuum test or pressure test, depending on the envi‐

ronmental conditions (noise around the area, location of leak,

etc.). The air entering the system and nitrogen escaping it

could be too low to generate a noise that would be noticeable

in the faulty area.

♦ Larger leaks in the refrigerant circuit (e.g. more than 100 g

refrigerant loss per day caused by a stone hitting the con‐

denser) can be detected depending on the environmental

conditions, e.g. noise coming from the faulty area, which is

noticeable during the vacuum test or pressure test

⇒ “2.5 Evacuating refrigerant circuit”, page 140 .

– Perform vacuum or pressure test ⇒ page 143 .

1.4.5

Detecting leaks in a pressure test (with

nitrogen or compressed air)

♦ Perform a vacuum test using the air conditioner service station

to see if any leaks can be found

⇒ “2.5 Evacuating refrigerant circuit”, page 140 . If a leak can

be detected but not the exact location of the leak, an additional

pressure test can be performed using nitrogen or compressed

air ⇒ page 143

1. Refrigerant circuit

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Note

♦ Smaller leaks in the refrigerant circuit (less than 100 g refrig‐

erant loss per year) cannot usually be found by means of the

vacuum test or pressure test. The amount of air entering the

system or the nitrogen-air escaping it is too low to detect the

faulty area through noise.

♦ It is also not always possible to detect leaks in the refrigerant

circuit with more than 100 g refrigerant loss per year by means

of the vacuum test or pressure test, depending on the envi‐

ronmental conditions (noise around the area, location of leak,

etc.). The air entering the system and nitrogen escaping it

could be too low to generate a noise that would be noticeable

in the faulty area.

♦ Larger leaks in the refrigerant circuit (e.g. more than 100 g

refrigerant loss per day caused by a stone hitting the con‐

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denser) can be detected depending on the environmental

conditions, e.g. noise coming from the faulty area, which is

noticeable during the vacuum test or pressure test

⇒ “2.5 Evacuating refrigerant circuit”, page 140 .

♦ A larger leak in the refrigerant circuit can be detected, for ex‐

ample, by pressurising the circuit to a maximum of 15 bar using

cleaned and dried compressed air or nitrogen ⇒ page 124 . If

the leak is large enough, the leakage point can be detected by

sound as the gas escapes.

Tools required:

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♦ 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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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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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

must be filled with at least 40 cm³of 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

If for instance 70 cm³refrigerant oil was poured out of the de‐

♦

fective air conditioner compressor, and 140 cm³oil 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

in this instance with 70 cm³of 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.

40 cm ³), 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

If for instance 50 cm³refrigerant oil was poured out of the de‐

♦

fective air conditioner compressor, and 100 cm³oil was pour‐

ed out of the replacement air conditioner compressor (a small

quantity of refrigerant oil remains in the air conditioner com‐

pressor), pour 50 cm³refrigerant 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

cm ³), 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

87

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

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

Note

♦ 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 .

88

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 1.5 Renewing components for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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