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 A/C 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.

Parts Catalog
- To accelerate drainage of refrigerant oil, rotate compressor e.g. by way of clutch plate of A/C clutch for example.
- Pour old refrigerant oil out of compressor (observe disposal HSO Environment Vol. 2-2. 43.1 ).
- 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 A/C compressor.

NOTE: In the event of internal (compressor) damage, check refrigerant hoses and condenser, If, e.g. swarf has penetrated, replace these refrigerant hoses.

- Clean (flush) refrigerant circuit with compressed air and nitrogen.
- Replace receiver or dryer cartridge, reservoir and restrictor.
- Examine expansion valve for dirt or corrosion; replace if necessary.
- Assemble, evacuate and charge refrigerant circuit.