Heating & Air Conditioning: Removal & Installation Audi TT 8N facelift

Replace compressor, without it being necessary to blow through the refrigerant system with compressed air and nitrogen (e.g. exterior damage after an accident)

1. Discharge A/C system.
2. Remove damaged compressor.
3. Remove oil drain plug from compressor.
4. Drain old refrigerant oil out of malfunctioning compressor into a measuring container. Record volume of drained refrigerant oil.

Note. Rotate compressor manually to speed up oil draining process. The compressor oil drain plug O-ring has been replaced with a sealing ring (always replace).

1. Drain refrigerant oil also out of replacement compressor into a clean container. Refill replacement compressor with amount of fresh oil equal to the amount poured out of malfunctioning compressor.

Example

From the malfunctioning compressor only 70 cm3 (2.4 oz.) of refrigerant oil was poured out. From the replacement compressor 220 cm3 of refrigerant oil poured out (a small amount remains in compressor). 70 cm3 (2.4 oz.) of refrigerant oil needs to be poured back into replacement compressor (oil originally from replacement compressor, held in clean container).

Note. If a larger amount of refrigerant oil poured out of the malfunctioning compressor, more than approx. 80 cm3 (2.7 oz.) the remaining refrigerant oil can be used for the condenser or receiver drier.

1. Assemble A/C system, evacuate and recharge.

Replace compressor due to leaks or internal damage (e.g. noises or no power)

1. Discharge A/C system.
2. Remove compressor.

Note. If there is internal damage (to compressor), check refrigerant hoses. If metal pieces are found to be embedded, replace hose.

1. Blow through A/C system with compressed air and nitrogen. Refer to «A/C refrigerant system (R-134a), flushing with compressed air and nitrogen»(ref-276291-S23618716122008010300000) .
2. Replace receiver drier and expansion valve.
3. Assemble A/C system, evacuate and charge.

Replace receiver drier after blowing through the A/C system e.g. caused by moisture contamination (the A/C system was open over a long period of time) or contamination (dirt)

1. Discharge A/C system.
2. Remove compressor.
3. Eliminate cause of malfunction.
4. Blow through A/C system with compressed air and nitrogen. Refer to «A/C refrigerant system (R-134a), flushing with compressed air and nitrogen»(ref-276291-S23618716122008010300000) .

1. Remove and check expansion valve for blockage/dirt and corrosion. Replace if necessary.
2. Remove oil drain plug out of compressor.
3. Drain and measure old refrigerant oil from compressor.

Note. Rotate compressor manually to speed up oil draining process.

1. Record volume of refrigerant oil drained.
2. Fill compressor with new refrigerant oil: the amount of oil must be equal to amount of old refrigerant oil drained.

Note. Fill amounts for refrigerant oil. Refer to A/C refrigerant R-134a and refrigerant oil (PAG), capacities . To ensure adequate compressor lubrication, add at least 80 cm3 (2.7 oz.) of refrigerant oil into compressor. The remainder can be added to new receiver drier. If there is dirt in the compressor of an open A/C system (e.g. during an accident), replace compressor.

1. Blow through A/C circuit with compressed air and nitrogen.
2. Replace receiver drier.
3. Assemble A/C system, evacuate and charge.

Replace receiver drier, without it being necessary to blow through A/C system with compressed air and nitrogen (e.g. damage caused by an accident), no refrigerant flowed out and no moisture and dirt have penetrated the circuit

1. Discharge A/C system.
2. Remove receiver drier.
3. Clean outside housing of receiver drier.
4. Weigh removed receiver drier.

1. Fill new receiver drier with new refrigerant oil until it weighs as much as removed receiver drier.
2. Install receiver drier.
3. Assemble A/C system, evacuate and recharge.