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Volkswagen Golf Service & Repair Manual: Without needing to purge refrigerant circuit of contaminants (cleaning), e.g. in cases of external damage after an accident

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / Renewing components / Renewing air conditioner compressor / Without needing to purge refrigerant circuit of contaminants (cleaning), e.g. in cases of external damage after an accident

Drain refrigerant circuit.
–  Remove air conditioner compressor.
  Note
If a different air conditioner compressor with other refrigerant oil is fitted, purge the refrigerant circuit with R134a refrigerant → Chapter.
Electrical air conditioner compressor:
If an electrical air conditioner compressor is renewed without having a mechanical fault (e.g. defective printed circuit board), the amount of refrigerant oil from this electrical air conditioner compressor must be determined.
  Note
The air conditioner compressor must be purged in order to extract the refrigerant oil which needs to be determined.
Purge the air conditioner compressor in normal direction of flow (from low-pressure inlet to high-pressure outlet).
In order to purge as much refrigerant oil from the air conditioner compressor as possible make sure that the high-pressure outlet of the air conditioner compressor is in the lowest position possible.
If an air conditioner service station without purging programme is used, the sequence has to be carried out manually (evacuate, purge 3 times with at least 2 kg of refrigerant each time and extract refrigerant again, evacuate).
Determined amount e.g. 50 cmі
Then, remove as much refrigerant oil from the new air conditioner compressor as is necessary to ensure that only the same amount of refrigerant oil which has been purged from the old air conditioner compressor remains in the new one (plus 10 cm 3). If, for example, the new original air conditioner compressor is filled with e.g. 200 cm3 of refrigerant oil, then remove only 140 cm3.
–  Pour old refrigerant oil out of air conditioner compressor. Handling refrigerant → Volkswagen ServiceNet; Service handbook; Environmental protection; Waste disposal; Current situation; Disposal channels; Disposal of used oils; Refrigerant oils.
  Note
If the amount of refrigerant oil which can be removed from the new air conditioner compressor is not sufficient, the new air conditioner compressor must be purged. After the new air conditioner compressor has been purged, fill the amount of refrigerant oil which has been determined when purging the old air conditioner compressor.
Mechanical air conditioner compressor:
–  Remove oil drain screw from air conditioner compressor.
–  To speed up the draining of the refrigerant oil, rotate the shaft of the air conditioner compressor using the magnetic clutch poly V-belt pulley. Not applicable for electrical air conditioner compressor.
–  Pour old refrigerant oil out of air conditioner compressor. Handling refrigerant → Volkswagen ServiceNet; Service handbook; Environmental protection; Waste disposal; Current situation; Disposal channels; Disposal of used oils; Refrigerant oils.
–  Remove oil drain screw from genuine air conditioner compressor, pour out refrigerant oil and replace it with only the quantity of fresh refrigerant oil equal to the amount of refrigerant oil poured out of the defective air conditioner compressor.
  Note
If for instance 70 cm3 refrigerant oil was poured out of the defective air conditioner compressor, and 220 cm3 oil was poured out of the genuine air conditioner compressor (a small quantity of refrigerant oil remains in the air conditioner compressor), Pour 70 cm3 refrigerant oil into the genuine air conditioner compressor (the refrigerant oil previously poured out of the genuine air conditioner compressor part may be used).
Different air conditioner compressors require different types and quantities of refrigerant oils → Rep. gr.87.
If a large quantity of refrigerant oil (more than about 80 cm3) was poured from the defective air conditioner compressor, the remaining refrigerant oil can also be poured into the evaporator or the reservoir or receiver → Rep. gr.87.
–  Renew restrictor. Depending on vehicle
–  Assemble refrigerant circuit, evacuate and charge.
   
Renewing air conditioner compressor
  Note On vehicles equipped with an electrical air conditioner compressor, de-energise the high-voltage system before removing the air conditioner compre ...

Leaks or internal damage (e.g. noises or lack of power)
–  Drain refrigerant circuit. –  Remove air conditioner compressor.   Note In the event ...

Other materials:

Important repair notes on air conditioning
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