VW Golf manuals

Volkswagen Golf Service & Repair Manual: If the refrigerant circuit was completely empty

Remove defective part.
–  Remove air conditioner compressor.
–  Remove oil drain screw from air conditioner compressor.
  Note
To speed up the draining of the refrigerant oil, rotate the shaft of the air conditioner compressor by hand using the poly V-belt pulley or the magnetic clutch.
Pour old refrigerant oil out of air conditioner compressor, handling refrigerant oil → Volkswagen ServiceNet; Service handbook; Environmental protection; Waste disposal; Current situation; Disposal channels; Disposal of used oils; Refrigerant oils.
Then fill the air conditioner compressor with the quantity of new refrigerant oil corresponding to the quantity in a genuine air conditioner compressor → Rep. gr.87.
Different types and quantities of refrigerant oils are required for different air conditioner compressors → Rep. gr.87.
To ensure proper lubrication of the air conditioner compressor when it runs for the first time, the air conditioner compressor must be filled with at least 80 cm3 of refrigerant oil; the remainder can be poured into the new reservoir or receiver → Rep. gr.87.
If dirt enters the air conditioner compressor whilst the refrigerant circuit is open (e.g. after an accident), the air conditioner compressor should be renewed.
Blow through refrigerant circuit with compressed air and remove moisture with nitrogen → Chapter.
–  Renew receiver or reservoir and restrictor.
–  Assemble the refrigerant circuit, evacuate it and charge it.
   
In the event of leaking or damaged components (apart from the air conditioner compressor, receiver or reservoir)
...

If there is still refrigerant in the refrigerant circuit
  Drain refrigerant circuit. –  Remove defective part, purge with compressed air and collect escaping refrigerant oil. ...

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