A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Receiver Dryer: Service and Repair
Receiver or Reservoir and Restrictor, Replacing
Replacing after flushing refrigerant circuit, e.g. on account of ingress of moisture (refrigerant circuit open for lengthy period) or contamination
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Discharge refrigerant circuit.
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Remove compressor.
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Rectify cause of trouble.
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Clean (flush) refrigerant circuit with compressed air and nitrogen.
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Examine expansion valve for dirt or corrosion and replace if necessary.
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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.
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To accelerate drainage of refrigerant oil, rotate compressor by way of clutch plate of A/C clutch for example.
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Pour old refrigerant oil out of compressor.
NOTE: Disposal of old refrigerant Audi-ServiceNet, Handbooks, HSO Environment 2
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Then fill compressor with quantity of fresh refrigerant oil corresponding to quantity of refrigerant oil in replacement compressor.
NOTE:
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Use different refrigerant oils and quantities for the various compressors.
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To ensure compressor lubrication on start-up, at least 80 cu.cm of refrigerant oil must be poured into the compressor. The remainder can be
added for example to the new reservoir or receiver.
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If dirt has penetrated into the compressor with the refrigerant circuit open (e.g. after an accident), compressor is to be replaced.
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Replace receiver or reservoir and restrictor.
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Assemble, evacuate and charge refrigerant circuit.
Replacing without the need for flushing refrigerant circuit with compressed air and nitrogen (e.g. in the event of accident damage); no escape
of refrigerant and no ingress of moisture and dirt into circuit
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Discharge refrigerant circuit.
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Replace restrictor.
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Remove receiver or reservoir.
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Remove dirt from receiver or reservoir.
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Weigh receiver or reservoir removed.
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Add refrigerant oil to new receiver or reservoir until weight of component removed has been attained.
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Install new receiver or reservoir.
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Assemble, evacuate and charge refrigerant circuit.