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Volkswagen Golf Mk7 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

This page lists when a Volkswagen Golf Mk7 reservoir, receiver or dryer cartridge does not need renewing — for example, after an accident that left it undamaged and unopened.

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.
   

    Questions & answers

    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 — Volkswagen Golf Mk7

    Can the Golf Mk7 AC drier be reused after purging?
    Only if the circuit was open for less than 30 minutes and no moisture entered. Otherwise the drier cartridge must be renewed.
    Renewing receiver or reservoir, and restrictor
    ...

    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
    Drain refrigerant circuit. –  Renew restrictor. Depending on vehicle –  Remove receiver or reservoir. ...

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