VW Polo manuals

Volkswagen Polo Service & Repair Manual: Refrigerant in A/C Service station Container, Filling

  Caution
If it is suspected that chemicals were added to the refrigerant circuit to seal leaks, do not connect the A/C service station and do not extract the refrigerant.
Chemicals that seal leaks in the coolant circuit form deposits that affect the function of the A/C system and lead to failure of the A/C system and the A/C service station.
Inform that customer that there are substances in the A/C system that are no approved by Volkswagen. This A/C system cannot be drained or serviced in the workshop.
  Note
The chemical materials (stop leak additive) for sealing leaks in the refrigerant circuit offered on the market are not approved by VW Audi AG. There are no permanent- ,validity or material compatibility tests. Therefore damage or malfunctions in the A/C system or the A/C Service Station cannot be excluded.
The stop leak additives offered on the open market have different physical and chemical properties, which can impair the function of the A/C system and the A/C Service Station and can even shut down the system completely.
VW does not approve the use of chemicals to seal leaks in the refrigerant circuit.
Chemicals used to seal leaks in the refrigerant circuit often react with air and the moisture in it. They cause deposits in the refrigerant circuit and the A/C service station and malfunctions in valves and other components that they come in contact with. These deposits cannot be removed completely from the components.
Chemicals used to seal leaks in the refrigerant circuit usually cannot be detected from outside. The label that should be applied to identify it is often missing. Therefore be careful when working with if you do not know its service history.
Accessories offer containers used to separate out these chemicals (used to seal leaks in the refrigerant circuit). Because VW does not approve the use of these chemicals, there is no evidence of the effectiveness of these filters.
The work procedure is always to be performed as described in the operating instructions for the A/C service station.
A certain quantity of refrigerant is specified as charge for each air conditioning system. To ensure that the correct amount of refrigerant is added and the cooling output is not reduced, the charging cylinder stands on a scale indicating the weight.
   
A/C System, Operating after Charging
  Caution If it is suspected that chemicals were added to the refrigerant circuit to seal leaks, do not connect the ...

A/C Service Station, Emptying
  Caution If it is suspected that chemicals were added to the refrigerant circuit to seal leaks, do not connect the ...

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