VW Golf manuals

Volkswagen Golf Service & Repair Manual: Draining air conditioner service station

  Note
If it becomes necessary to drain the air conditioner service station (e.g. because contaminated refrigerant was extracted), all filters and dryers are to be renewed as a rule. Do not take the filters and dryers out of their airtight packaging until immediately prior to installation in order to keep moisture absorption (hygroscopic property) as low as possible.
Refrigerant bottles that have been charged with contaminated, used refrigerant are referred to as “recycling bottles”.
Recycling bottles must be evacuated as a rule before being filled for the first time with refrigerant. Refrigerant bottles that have air in them must not be filled with refrigerant.
Different types of refrigerants must not be mixed with each other. Mixed refrigerants cannot be processed for reuse. They have to be disposed of. If the composition of the contents of the bottle is uncertain, the refrigerant recycler must be informed of this.
  WARNING
When charging recycling bottles (compressed gas containers), observe existing regulations, technical rules and laws.
Never overcharge recycling bottles. The gas cushion (expansion space) of overcharged recycling bottles is too small to accommodate expansion of the fluid caused by a rise in temperature. There is a risk that the bottle will burst.
For your own safety, use only recycling bottles with a built-in safety release valve.
Recycling bottles must be weighed on a calibrated scale while being charged. The maximum permitted charge quantity is 75% (fill factor 0.75) of the charge weight shown on the recycling bottle (the possibility cannot be excluded that along with the refrigerant, refrigerant oil is drawn into the recycling bottle).
   
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