Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2005A4 QUATTRO, 4D SEDAN, 3.2 GREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)GENERAL SERVICINGREFRIGERANT R134A - SERVICING87 - AIR CONDITIONINGREFRIGERANT CIRCUIT COMPONENTS, REPLACINGCOMPRESSOR, REPLACING WITHOUT FLUSHING REFRIGERANT CIRCUIT
2005 Audi A4 Quattro, 4D Sedan, 3.2 G
Compressor, Replacing without Flushing Refrigerant Circuit
2005 Audi A4 Quattro, 4D Sedan, 3.2 GSECTION Compressor, Replacing without Flushing Refrigerant Circuit
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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.