Compressor, Replacing without Flushing Refrigerant Circuit
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NOTE:
- Cleaning refrigerant circuit means flushing it with refrigerant R134a → Refrigerant Circuit, Flushing with Refrigerant R134a or blowing through with compressed air and nitrogen → Refrigerant Circuit, Flushing with Compressed Air and Nitrogen ).
For example, 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.
→ Electronic Parts Catalog ETKA
- 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 cm 3 of refrigerant oil has been poured out of the malfunctioning compressor and 220 cm 3 out of the replacement compressor (a small quantity of refrigerant oil remains in the compressor), fill the compressor to be installed with 70 cm 3 of refrigerant oil (use can be made of oil poured out of replacement compressor).
- Use different refrigerant oils and quantities for the various compressors → Refrigerant R134a/Refrigerant Oil Capacities and Specifications .
- If a greater quantity of refrigerant oil (more than approx. 80 cm 3 ) has been poured out of the malfunctioning compressor, the remaining refrigerant oil can also be added to the evaporator or reservoir/receiver → Refrigerant R134a/Refrigerant Oil Capacities and Specifications .
- Replace restrictor.
- Assemble, evacuate and charge refrigerant circuit.