VW Golf manuals

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.
Evacuating:
  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.
–  Switch off ignition.
–  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).
→ Rep. gr.87
–  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
   
Draining refrigerant circuit using air conditioner service station
  WARNING High-voltage on high-voltage system. Danger of electric shock on air conditioner compressor! ...

Charging refrigerant circuit using air conditioner service station
  WARNING High-voltage on high-voltage system. Danger of electric shock on air conditioner compressor! ...

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