Leaking or Damaged Components except Compressor, Reservoir, or Receiver

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Refrigerant Circuit Completely Empty

NOTE:

In the event of only a minor leak with slow escape of refrigerant (e.g. at a small leakage point), the amount of refrigerant oil lost and the amount of moisture penetrating is not sufficient to influence operation of the air conditioner.
The operations marked * are only to be implemented in the case of a major leak (e.g. following an accident).
Remove malfunctioning component.
Remove compressor.*
Remove oil drain plug from compressor.*

NOTE:

The oil drain plug of "Denso" and "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 ).
Then fill compressor with quantity of fresh refrigerant oil corresponding to quantity of refrigerant oil in replacement compressor → Approved Refrigerant Oils .*
Use different refrigerant oils and quantities for the various compressors → Approved Refrigerant Oils .
To ensure compressor lubrication on start-up, at least 80 cm ³ of refrigerant oil must be poured into the compressor. The remainder can be added for example to the new reservoir or receiver → Approved Refrigerant Oils .
If dirt has penetrated into the compressor with the refrigerant circuit open (e.g. after an accident), compressor is to be replaced.
Clean refrigerant circuit (flush with refrigerant R134a → Refrigerant Circuit, Flushing with Refrigerant R134a or blow through with compressed air and nitrogen → Refrigerant Circuit, Flushing with Compressed Air and Nitrogen )*
Replace dryer cartridge, receiver* or reservoir* and restrictor.
Assemble, evacuate and recharge refrigerant circuit → Electronic Parts Catalog ETKA.

Refrigerant Circuit Contains Refrigerant

Discharge refrigerant circuit.

Remove malfunctioning component, flush with compressed air and collect escaping refrigerant oil.

The new component is to be filled with the amount of refrigerant oil flushed out (plus 20 cm ³ for evaporator, plus 10 cm ³ for condenser, refrigerant pipes and refrigerant hoses) as fresh refrigerant oil fill.

NOTE:

Disposal of old refrigerant → Audi-ServiceNet, Handbooks, HSO Environment 2
Replace restrictor.
Assemble, evacuate and charge refrigerant circuit.