Get Air conditioning system -> 2.11 Cleaning electrical air conditioning compressor Guide for Volkswagen Touran 4 Door Second Generation (2015-2022)

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

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

– Switch off ignition.

– Detach the air conditioner service station from the refrigerant

circuit and switch off

⇒ “2.8 Switching off air conditioner service station and sepa‐

rating from refrigerant circuit”, page 151 .

Vehicles with electrical air conditioning compressor

•

The engine may only be started when the refrigerant circuit

has been fully assembled.

•

On vehicles with battery cooling, hybrid operation is only pos‐

sible with the air conditioning system charged and no faults

stored in connection with the air conditioning system ⇒ Vehicle

diagnostic tester in “Guided Fault Finding” mode - air condi‐

tioning system and battery regulation.

•

First bring the electrical air conditioner compressor into oper‐

ation after installing the air conditioner compressor and charg‐

ing the refrigerant circuit via the “Compressor run-in” function

in basic settings. Should there be an accumulation of refriger‐

ant oil in the compression chamber of the air conditioner

compressor before installation owing to unfavourable storage,

damage could be caused to the air conditioner compressor

⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode -

air conditioning system and battery regulation.

An electrically driven air conditioner compressor may only be

activated when the refrigerant circuit is charged. Running the

air conditioner compressor with the refrigerant circuit empty

could lead to compressor damage ⇒ Vehicle diagnostic tester

in “Guided Fault Finding” mode - air conditioning system and

battery regulation.

– To minimise the number of automatic engine starts when the

vehicle's drive system is active (READY) during test and

measurement work, charge the vehicle batteries e.g. with the

battery charger 60 A - VAS 5904- in battery standby mode ⇒

Electrical system - General information; Rep. gr. 27 ; Charging

battery and ⇒ Electrical system; Rep. gr. 93 ; General warn‐

ings for work on the high-voltage system .

– For test and measurement work that requires the vehicle's

drive system to be active (READY) or the ignition to be switch‐

ed on, move the selector lever to position “P”, activate the

parking brake and arrange the tools needed so that they can‐

not come into contact with moving components of the engine

and so that they cannot even come near to components that

turn when the engine is running.

2.8

Switching off air conditioner service sta‐

tion and separating from refrigerant cir‐

cuit

– Finish the requisite work with the air conditioner service sta‐

tion .

– Switch off ignition.

– Unscrew (close) the handwheels of both service couplings.

2. Working with air conditioner service station

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151

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

CAUTION

Risk of freezing injury caused by escaping pressurised refrig‐

erant.

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

freezing.

– Wear protective gloves.

– Wear protective goggles.

– If, when loosening the handwheel of the service coupling,

refrigerant escapes from the refrigerant line for longer than

1 second, screw in the handwheel and renew the defective

valve.

– 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.

Different versions of service couplings

♦ On one version of service coupling, the space between the

valve in the service connection of the refrigerant circuit and the

valve in the service coupling is vented externally when the

handwheel is unscrewed. On these service couplings, the

valve in the service connection of the vehicle is closed first,

followed by the valve in the service coupling for the charge

hose of air conditioner service station when the handwheel of

the service coupling is unscrewed. As it is unscrewed further,

the pressure still present between the two valves is released

via an additional valve (approx. 2 cm of refrigerant). Should

one of these two valves (the valve in the service connection of

the vehicle or the valve in the service coupling for the charge

hose) not close properly, the whole refrigerant could escape

out of the refrigerant circuit of the vehicle or the charge hose.

♦ On another version of service coupling, the space between the

valve in the service connection of the refrigerant circuit and the

valve in the service coupling is not vented externally when the

handwheel is unscrewed. This version features a valve that is

open when the service coupling is connected, which facilitates

pressure compensation between the space to the valve in the

service connection of the refrigerant circuit and the charge

hose connected to the service coupling. On this version, no

refrigerant escapes when the handwheel of the service cou‐

pling is unscrewed, which is why the refrigerant has to be

extracted from the charge hoses into the air conditioner serv‐

ice station here before the service couplings are disconnected.

If a large amount of refrigerant is recovered here, for example,

after a pressure test or after charging the refrigerant circuit

(more than approx. 50 g), this is an indication that a valve in

one of the service connections of the refrigerant circuit could

be leaking and refrigerant is escaping from the refrigerant cir‐

cuit of the vehicle (extract refrigerant and renew the defective

valve)

Before extracting the refrigerant from the charge hoses into the

air conditioner service station , unscrew the handwheels of both

service couplings as far as they will go.

152

Rep. gr.87 - Air conditioning system

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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

♦ Stored in the air conditioner service station is a function via

which it is switched to a specific operating mode when deac‐

tivated. The whole refrigerant is extracted from the charge

hoses into the air conditioner service station with this function.

♦ If the handwheels of the two service couplings are not un‐

screwed when this function is activated, refrigerant could be

extracted from the vehicle's refrigerant circuit.

– Extract the refrigerant from the two charge hoses using the air

conditioner service station as instructed in the relevant oper‐

ating manual ⇒ Operating instructions of air conditioner serv‐

ice station .

Note

♦ If, on an air conditioner service station with a service coupling

that does not vent to the outside, this process takes longer

than approx. 2 minutes or quite a large amount of refrigerant

is extracted, this suggests that there is a fault in one of the

valves in a service connection.

♦ If, on an air conditioner service station with a service coupling

that does vent to the outside, this process takes longer than

approx. 2 minutes, this suggests that there is a fault in one of

the valves in a service coupling.

Note

Erroneous extraction from vehicle's refrigerant circuit.

– First unscrew (close) the handwheels of the quick-release

coupling adapters.

– Then extract the refrigerant from the two charge hoses using

the air conditioner service station.

– Switch off the air conditioner service station (and isolate it from

the power supply if necessary) ⇒ Operating instructions air

conditioner service station .

– Separate the quick-release couplings from the service con‐

nections of the refrigerant circuit.

– Screw the sealing caps on the service connections (see vehi‐

cle-specific refrigerant circuit) ⇒ Heating, air conditioning;

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

circuit .

2.9

Charging refrigerant in reservoir

– Connect the cylinder with fresh R1234yf refrigerant to the

service coupling on the high pressure side of the air condi‐

tioner service station ⇒ Operating instructions air conditioner

service station .

– Perform a gas analysis on the refrigerant (from the cylinder

supplied) with which the system is to be charged using the air

conditioner service station

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

•

The procedure described in the operating manual for your air

conditioning service station is to be followed ⇒ Operating

manual for air conditioner service station .

2. Working with air conditioner service station

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Air conditioning system -> 2.11 Cleaning electrical air conditioning compressor for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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