Get Working with air conditioner service station -> 2.7 Bringing air conditioning system into service after charging Guide for Volkswagen Scirocco SUV Third Generation (2008-2017)

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

Note

On vehicles with high-voltage system and auxiliary air condition‐

ing system functions (“heat pump mode” or “cooling of high-

voltage battery”), valves may be installed in the refrigerant circuit

that are not open when de-energised. These valves are opened

and closed e.g. via incremental motors and are no longer actu‐

ated when the ignition is switched off. To completely empty,

correctly evacuate and charge the refrigerant circuit, however, no

areas may be isolated. Therefore, these valves must be opened

before these measures are carried out. On completion of the

work, enable actuation of these valves again via the respective

control unit ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant

circuit (vehicle-specific workshop manual) and ⇒ Vehicle diag‐

nostic tester in “Guided Fault Finding” mode.

All vehicles

If it is necessary to perform a function check after charging the

refrigerant circuit:

– Check the pressures in the refrigerant circuit ⇒ page 170 .

If it is not necessary to perform a function check after charging

the refrigerant circuit:

– 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 .

2.7

Bringing air conditioning system into

service after charging

Note

♦ If the mechanical air conditioner compressor was removed,

turn it approx. 10 times by hand before initial operation (during

installation or after installation e.g. before fitting the belt) so

that no damage is caused from a fluid shock when it is switch‐

ed on the first time (if there is refrigerant oil in the cylinder of

the air conditioner compressor, this will be forced out by turn‐

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

compressor; Removing and installing air conditioner compres‐

sor .

♦ If the electrical air conditioner compressor was removed, be‐

fore bringing the air conditioning system into operation for the

first time and after charging, the air conditioner compressor is

to be brought into operation via the “Basic setting, compressor

run-in” function in guided fault finding ⇒ Vehicle diagnostic

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

and battery regulation. This prevents damage to the air con‐

ditioner compressor, e.g. from a fluid shock, during initial

activation (if there is refrigerant oil in the compression cham‐

ber of the air conditioner compressor, this will be forced out).

♦ The mechanical air conditioner compressor is driven by the

engine via a belt or a shaft. The electrical air conditioner com‐

pressor is driven by an electric motor mounted directly on the

air conditioner compressor (e.g. on vehicles with hybrid drive)

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

pressor; Removing and installing air conditioner compressor .

2. Working with air conditioner service station

149

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

Bringing air conditioning system with mechanical air conditioning

compressor into operation

– Switch on ignition.

– Set the air conditioning system to the lowest output possible

(e.g. select operating mode “A/C OFF”).

– Switch off actuation of the air conditioner compressor (e.g.

select operating mode “A/C OFF”).

– Start the engine with the air conditioner compressor switched

off (e.g. operating mode “A/C OFF” selected).

– Wait until idling speed has stabilised:

– Switch air conditioner compressor on and let system run for at

least 2 minutes with engine idling.

– If necessary, check the pressures in the refrigerant circuit us‐

ing the air conditioner service station ⇒ page 129 .

– Switch off engine.

– 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 .

Bringing air conditioning system with electrical air conditioning

compressor into operation

– Switch on ignition.

– Bring the air conditioner compressor into operation via the

“Basic settings, compressor run-in” function of guided fault

finding ⇒ Vehicle diagnostic tester in “Guided Fault Finding”

mode - air conditioning system and battery regulation.

In addition for vehicles with electrically-actuated valves in the re‐

frigerant circuit that are not open when de-energised:

– Use the vehicle diagnostic tester to enable (open or close) the

electrically-actuated valves - that are not open when de-ener‐

gised - for operation of the air conditioning system via the

respective control unit ⇒ Vehicle diagnostic tester in “Guided

Fault Finding” mode.

Note

On vehicles with high-voltage system and auxiliary air condition‐

ing system functions (“heat pump mode” or “cooling of high-

voltage battery”), valves may be installed in the refrigerant circuit

that are not open when de-energised. These valves are opened

and closed e.g. via incremental motors and are no longer actu‐

ated when the ignition is switched off. To completely empty,

correctly evacuate and charge the refrigerant circuit, however, no

areas may be isolated. Therefore, these valves must be opened

before these measures are carried out. On completion of the

work, enable actuation of these valves again via the respective

control unit ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant

circuit; System overview - refrigerant circuit and ⇒ Vehicle diag‐

nostic tester in “Guided Fault Finding” mode.

All air conditioning systems with electrical air conditioning com‐

pressor

– After the basic setting, check the pressures in the refrigerant

circuit if necessary using the air conditioner service station .

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

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

150

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

– 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

151

Working with air conditioner service station -> 2.7 Bringing air conditioning system into service after charging for Your Volkswagen Scirocco SUV Third Generation (2008-2017)

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