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Renewing receiver or reservoir without the need for refrigerant circuit cleaning > < Renewing air conditioner compressor on account of leakage or internal damage

A4 Mk1

Renewing receiver or reservoir and restrictor after cleaning refrigerant circuit
Renewing receiver or reservoir and restrictor after cleaning refrigerant circuit
  Note
Cleaning the refrigerant circuit means flushing with refrigerant R134a → Chapter or blowing out with compressed air or nitrogen → Chapter.
For example on account of ingress of moisture (refrigerant circuit open for lengthy period) or contamination
–  Discharge refrigerant circuit.
–  Remove the air conditioner compressor.
–  Eliminate cause of fault.
–  Clean refrigerant circuit (flush with refrigerant R134a → Chapter or blow out with compressed air or nitrogen → Chapter).
–  Check expansion valve for dirt or corrosion and renew if necessary
Electrically driven air conditioner compressor
–  Flush the old refrigeration oil out of the air conditioner compressor → Chapter.
Mechanically driven air conditioner compressor
–  Remove oil drain screw from air conditioner compressor.
  Note
There are different versions of the oil drain plug and the corresponding seal (an O-ring or a sealing ring may be fitted, always renew) → Chapter and → Electronic parts catalogue.
–  To accelerate drainage of the refrigerant oil, crank the air conditioner compressor by way of the magnetic clutch plate for example.
–  Pour the old refrigerant oil out of the air conditioner compressor.
  Note
Disposal of old refrigeration oil → Audi-ServiceNet, HSO Environmental Protection.
All air conditioner compressors
–  Then add the quantity of fresh refrigerant oil to the air conditioner compressor corresponding to the quantity of refrigerant oil in the replacement compressor (or the specified quantity of refrigerant oil on vehicles with two evaporators if applicable) → Chapter.
  Note
t  Use different refrigerant oils and quantities for the various air conditioner compressors → Chapter.
t  To ensure air conditioner compressor lubrication on start-up, at least 80 cm3 of refrigerant oil must be poured into the air conditioner compressor. The remainder can be added for example to the new reservoir or receiver → Chapter.
t  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.
t  On vehicles with two evaporators, the quantity of refrigerant oil in the refrigerant circuit may be greater than the quantity in the replacement compressor. On such vehicles, add the extra quantity of refrigerant oil to the refrigerant circuit as necessary → Chapter.
–  Renew receiver or reservoir and restrictor.
–  Assemble, evacuate and charge refrigerant circuit.
   

Renewing receiver or reservoir without the need for refrigerant circuit cleaning > < Renewing air conditioner compressor on account of leakage or internal damage