VW Golf manuals

Volkswagen Golf Service & Repair Manual: Working with the air conditioner service station

  Caution
If there is evidence to suggest that chemical substances have been added in the vehicle to seal leaks, do not connect the air conditioner service station and do not extract the refrigerant.
Chemical substances used to seal leaks form deposits in the refrigerant circuit. These can impair the function of the air conditioning system and cause the air conditioning system (and your air conditioner service station) to fail.
Make your customer aware of the fact that there are substances in his/her air conditioning system that do not have VW approval. This air conditioning system cannot be drained or repaired by you.
  Note
Volkswagen AG does not authorise the use of chemical substances (leak inhibitor additives) for purposes of sealing leaks in refrigerant circuits. There are currently no permanent, effective or material compatible tests that guarantee never causing damage or malfunctions in an air conditioning system or air conditioner service station.
The leak inhibitor additives currently available on the market have differing physical and chemical characteristics that may subsequently affect the function of the air conditioning system and air conditioner service station or even cause a total failure.
Volkswagen rejects the use of chemical substances for purposes of sealing leaks in refrigerant circuits.
Chemical substances used for sealing leaks in refrigerant circuits often react with the surrounding air and the humidity contained within. They cause deposits to build up in the refrigerant circuit (and your air conditioner service station), valves to malfunction and defects in other components with which they come into contact. These deposits cannot be completely removed from the components.
It is often not possible to detect from the outside whether chemical substances have been used to seal leaks in the refrigerant circuit. The adhesive label that serves to identify its use can usually not be found. Therefore, exercise caution on vehicles for which you have no service or repair record.
Containers or tanks are offered as accessories on the open market that are designed to separate these chemical substances (to seal leaks). Since Volkswagen rejects the use of these substances, no statement can be made at this point regarding the effectiveness and separation rate of these filters.
   
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