A/C Compressor, Replacing

A/C Compressor, Replacing

without the need for removing contaminants from the refrigerant circuit (flushing), e.g. in case of external damage after an accident
- Discharge refrigerant circuit
- Remove A/C compressor.
- Remove oil drain plug from A/C compressor.

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

- 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 A/C compressor. For instructions on handling refrigerant oil, refer to Volkswagen After Sales; ServiceNet; handbooks; HSO; Volume 2; emission protection; refrigerant from A/C system / refrigerant oil.
- Remove oil drain plug from original part compressor (replace O-ring), 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 original part 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 original part 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.

Replacing compressor on account of leakage or internal damage (e.g. noise or no output)
- Discharge refrigerant circuit
- Remove A/C compressor.

NOTE: In the case of internal damage (on A/C compressor), flush refrigerant circuit with refrigerant R134a.

- Replace fluid reservoir/dryer cartridge and expansion valve or reservoir and restrictor.
- Assemble, evacuate and charge refrigerant circuit.