Volkswagen Golf Service & Repair Manual: Evacuating refrigerant circuit using air conditioner service station
| Always follow the procedure described in the user's manual
for your air conditioner service station. |
| The procedure described here is that for air conditioner
service station -VAS 6007A-. |
| Before the refrigerant circuit is charged with refrigerant,
it should be evacuated (air empty) for 45 minutes for single
evaporator system and 60 minutes for 2 evaporator systems. In
addition, all moisture should be extracted from the circuit. |
| Leakage can be determined when evacuating the refrigerant
circuit. |
Caution
| The engine must not be started during the evacuation
procedure and as long as there is a vacuum present in
the refrigerant circuit. |
| The air conditioner compressor may be damaged if the
engine is started when a vacuum is present in the
refrigerant circuit. |
| Only start engine when refrigerant circuits are
charged. |
|
| – |
If necessary, check the refrigerant oil quantity in the
refrigerant circuit; see vehicle-specific repair manual
→ Rep. gr.87. |
| – |
Connect air conditioner service station to power supply. |
| – |
Check the refrigerant quantity in the air conditioner
service station. |
| – |
Connect the charging hose of the air conditioner service
station to the vehicle refrigerant circuit using quick-release
coupling adapters (see vehicle-specific refrigerant circuit). |
| – |
Turn the handwheel of the quick-release coupling adapter far
enough inwards to ensure that the valves on the service
connections are open (do not overstress the valve). |
 Note
| Where a vehicle has a service connection on only one side of
the refrigerant circuit, if the system pressure has to be
measured after charging, use the valve adapter and charging hose
with valve opener. |
| – |
Initiate the vacuum phase on the air conditioner service
station. The refrigerant circuit will be evacuated automatically
(observe preset evacuation period). |
| When the vacuum phase has been completed, the leakage test
of the refrigerant circuit will start. The displays show the
vacuum in bar and the time in seconds. |
| If the vacuum is not maintained, proceed as follows: |
| – |
Initiate the vacuum phase on the air conditioner service
station again. The refrigerant circuit will be evacuated
automatically (observe preset evacuation period). Observe vacuum
gauge for a longer period. Charging may be done only when vacuum
is maintained. |
| If a leak is present of a magnitude where air enters during
the evacuation phase so that the air conditioner service station
cannot create sufficient vacuum or the vacuum gauge indicates an
ingress of air so that the vacuum collapses immediately after
switching off the air conditioner service station. |
| – |
Search for the leak in the refrigerant circuit as follows:
→ Chapter |
|
|
|
WARNING
High-voltage on high-voltage system. Danger of
electric shock on air conditioner compressor!
...
WARNING
High-voltage on high-voltage system. Danger of
electric shock on air conditioner compressor!
...
Other materials:
Indicator lamp
First read and observe the introductory information
and safety warnings
Lit up
Possible cause
Solution
Engine management system fault (Electronic Power Control).
The engine should be checked by a qualified workshop
as s ...
Front brakes
The type of brake system installed in the vehicle is
indicated among other things by the corresponding PR number on
the vehicle data sticker.
The vehicle data sticker can be found in the spare wheel
well and in the service schedule.
...
O-ring
Use only O-rings that are resistant to refrigerant R134a and
related refrigerant oils. O-rings are no longer colour-coded.
Coloured and black O-rings are used.
Check that the O-rings used have the correct internal
diameters.
...
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Draining refrigerant circuit using air conditioner service station
Charging refrigerant circuit using air conditioner service station