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Volkswagen Polo Service & Repair Manual: A/C Service Station, Connecting for Measuring and Testing

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / A/C Service Station, Working with / A/C Service Station, Connecting for Measuring and Testing

  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.
Work procedure may vary depending on the type of tools selected (the tool-specific operating instructions should therefore be followed).
  Note
The work procedure is always to be performed as described in the operating instructions for the A/C Service Station -VAS6007A- (or subsequent models).
The charging hoses are to be connected as follows to prevent the ingress of air or moisture into the refrigerant circuit:
–  Turn off the ignition.
–  Connect the A/C service station to the power supply.
–  Remove the cap from the service connections or connections with a valve (see vehicle-specific refrigerant circuit).
Refer to → Rep. Gr.87.
–  Evacuate the filler hose.
  Note
Connect filler hose with quick-release couplings to refrigerant circuit service connections.
  Caution
Never open valves on low or high-pressure side with engine running. Otherwise, compressor or service station could be destroyed by a “short circuit” between high and low-pressure sides of refrigerant circuit if air conditioning system is switched on.
–  Only tighten the handwheel in the quick-release coupling just enough so the service connection is open. Watch the pressure gauge and do not place too much pressure on the valve.
–  Start the engine and perform the planned tests and measurements.
–  Compare values determined to specified measured values. Refer to → Chapter „Refrigerant Circuit Pressures (with A/C Service Station), Checking“.
–  Loosen the handwheel to close the quick-release coupling before disconnecting it.
Important Information when Working with the A/C Service Station
  Caution If it is suspected that chemicals were added to the refrigerant circuit to seal leaks, do not connect the ...

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

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