Audi Workshop Service and Repair Manuals > A4 Mk2 > Heating, ventilation, air conditioning system | Air conditioner with refrigerant R134a | Air conditioner | Renewing components of refrigerant circuit | Renewing components | Leaking or damaged components (except air conditioner compressor, reservoir or receiver)

Leaking or damaged components (except air conditioner compressor, reservoir or receiver)

Refrigerant circuit completely empty (e.g. in the event of major leakage or a burst hose)

Note

t	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 ingressing is not sufficient to influence operation of the air conditioner.

t	The operations marked * are only to be implemented in the case of a major leak (e.g. following an accident).

Electrically driven air conditioner compressor

–	Remove defective component.

–	Remove and flush the electrically driven air conditioner compressor → Chapter

Clean refrigerant circuit (flush with refrigerant R134a → Chapter or blow out with compressed air or nitrogen → Chapter).*

–	Pour the full specified amount of oil into the air conditioner compressor or circuit.

Mechanically driven air conditioner compressor

–	Remove defective component.

–	Remove the air conditioner compressor.*

–	Remove the oil drain plug -B- / -D- from the air conditioner compressor -A-.*

Note

t	The design of the oil drain plug -B- / -D- and the seal -C- / -E- varies (depending on the air conditioner compressor manufacturer).

t	Pay attention to the tightening torque when fitting the oil drain plug -B- / -D- (depends on the air conditioner compressor manufacturer and the design of the oil drain plug) → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual).

t	On the „Denso“ or „Nippondenso“ air conditioner compressor, the oil drain plug -D- is fitted with a sealing ring -E- for example; always renew → Electronic parts catalogue.

t	On the „Sanden“ or „Zexel“ air conditioner compressor, the oil drain plug -B- is fitted with an O-ring -C- for example; always renew → Electronic parts catalogue.

t	To accelerate drainage of the refrigerant oil, crank the air conditioner compressor by way of the magnetic clutch plate for example.

t	Pour the old refrigerant oil out of the air conditioner compressor* (disposal → Audi-ServiceNet, HSO Environmental Protection).

All models

Note

t	Then fill the air conditioner compressor with the quantity of fresh refrigerant oil corresponding to the quantity of refrigerant oil in the replacement compressor → Chapter.*

t	Use different refrigerant oils and quantities for the various air conditioner compressors → Chapter.

t	To ensure air conditioner compressor lubrication on start-up, at least 80 cm³ of refrigerant oil must be poured into the air conditioner compressor. The remainder can be added for example to the new reservoir or receiver → Chapter.

t	If dirt has ingressed into the air conditioner compressor with the refrigerant circuit open (e.g. after an accident), the air conditioner compressor is to be renewed.

t	Clean refrigerant circuit (flush with refrigerant R134a → Chapter or blow out with compressed air or nitrogen → Chapter).*

–	Renew dryer cartridge, receiver* or reservoir* and restrictor.

–	Assemble, evacuate and re-charge refrigerant circuit.

Audi Workshop Service and Repair Manuals