A/C Compressor, Replacing

A/C Compressor, Replacing

Compressor, replacing without the need for flushing refrigerant circuit with compressed air and nitrogen (e.g. in the event of external damage following an accident)
- Discharge refrigerant circuit.
- Remove compressor.
- Remove oil drain plug from compressor.

NOTE: The oil drain plug of "Denso" (Nippondenso) compressors is equipped with an oil seal instead of an O-ring and this is always to be replaced.

- To accelerate drainage of refrigerant oil, rotate compressor by way of clutch plate of A/C clutch for example.
- Pour old refrigerant oil out of compressor (disposal Audi-ServiceNet, Handbooks, HSO Environment 2).
- Remove oil drain plug from replacement compressor, pour out refrigerant oil and only add a quantity of fresh refrigerant oil equal to the amount poured out of the malfunctioning compressor.

NOTE:
- If, for example, 70 cu.cm of refrigerant oil has been poured out of the malfunctioning compressor and 220 cu.cm out of the replacement compressor (a small quantity of refrigerant oil remains in the compressor), fill the compressor to be installed with 70 cu.cm of refrigerant oil (use can be made of oil poured out of replacement compressor).
- Use different refrigerant oils and quantities for the various compressors.
- If a greater quantity of refrigerant oil (more than approx. 80 cu.cm) has been poured out of the malfunctioning compressor, the remaining refrigerant oil can also be added to the evaporator or reservoir/receiver.

- Replace restrictor.
- Assemble, evacuate and charge refrigerant circuit.

Compressor, replacing on account of leakage or internal damage (e.g. noise or no output)
- Discharge refrigerant circuit.
- Remove compressor.

NOTE: In the event of internal (compressor) damage, check refrigerant hoses and condenser. If, e.g. swarf has penetrated, clean refrigerant hoses and condenser "Cleaning (flushing) refrigerant circuit with compressed air and nitrogen" and replace condenser if necessary.

- Replace receiver or reservoir and restrictor.
- Examine expansion valve for dirt or corrosion and replace if necessary.
- Assemble, evacuate and charge refrigerant circuit.