Volkswagen Golf Service & Repair Manual: After purging refrigerant circuit of contaminants, e.g. due to moisture
intrusion (because refrigerant circuit has stood open for a length of time) or
due to dirt
| The reservoir or receiver or cartridge of the dryer bag need
not be renewed under the following circumstances: |
| After an accident in which there was no damage to the
reservoir or receiver. |
| Repairs are performed quickly (no more delay than during a
normal repair time) and there was no moisture intrusion. The
vehicle is no more than 5 years old. |
| The reservoir or receiver or dryer cartridge should be
renewed under the following circumstances: |
| The refrigerant circuit was opened and the vehicle is more
than 5 years old. |
| The refrigerant circuit has been opened for in indeterminate
period (seepage leak). |
| Repairs take longer than a normal repair time and there has
been moisture intrusion. |
| Always renew collector/reservoir or dryer cartridge after
blowing through with compressed air or purging with refrigerant
R134a. Keep genuine parts sealed for as long as possible to keep
the ingress of moisture as low as possible. |
| The air conditioner compressor seizes. |
| The reservoir or receiver is damaged (e.g. in an accident). |
| – |
Drain refrigerant circuit. |
| – |
Remove air conditioner compressor. |
| – |
Rectify cause of fault. |
| – |
Examine the expansion valve for dirt or corrosion; renew if
necessary. |
| – |
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. |
| – |
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. |
| – |
Then fill the air conditioner compressor with a quantity of
new refrigerant oil equal to the quantity in a genuine air
conditioner compressor
→ Rep. gr.87. |
 Note
| Types and quantities of refrigerant oils which should be
used for different air conditioner compressors
→ Rep. gr.87. |
| To ensure proper lubrication of the air conditioner
compressor when it runs for the first time, the air conditioner
compressor must be filled with at least 80 cm3
of refrigerant oil; the remainder can be poured into the new
reservoir or receiver
→ Rep. gr.87. |
| If dirt enters the air conditioner compressor whilst the
refrigerant circuit is open (e.g. after an accident), the air
conditioner compressor should be renewed. |
| – |
Renew receiver or reservoir and restrictor. |
| – |
Assemble refrigerant circuit, evacuate and charge. |
|
|
|
Drain refrigerant circuit.
–
Renew restrictor. Depending on vehicle
–
Remove receiver or reservoir.
...
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Without needing to purge refrigerant circuit of contaminants (e.g. damage in
an accident); no refrigerant has escaped and no moisture or dirt has entered
refrigerant circuit