| 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. |
|
|
|
Questions & answers
Without needing to purge refrigerant circuit of contaminants (cleaning), e.g. in cases of external damage after an accident — Volkswagen Golf Mk7
How do I replace a Golf Mk7 AC compressor after accident damage (no contamination)?
Drain circuit, remove compressor, check oil quantity, install new compressor with correct oil, evacuate and recharge. No purging needed if no moisture entered.
Note
On vehicles equipped with an electrical air conditioner
compressor, de-energise the high-voltage system before removing
the air conditioner compre ...
–
Drain refrigerant circuit.
–
Remove air conditioner compressor.
Note
In the event ...
Renewing air conditioner compressor
Leaks or internal damage (e.g. noises or lack of power)