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Volkswagen Polo Service & Repair Manual: Refrigerant Circuit, Tracing Leaks, with Electronic Leak Detector -VAG1796

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / Refrigerant Circuit, Detecting Leaks / Refrigerant Circuit, Tracing Leaks, with Electronic Leak Detector -VAG1796

  Note
This repair manual describes different methods for detecting leaks in the refrigerant circuit. These methods have been tested and result in success when used correctly.
If when searching for compressed air / Nitrogen or vacuum leaks none are found, add a leak detection additive i.e UV leak detection additive, to the electric leak detecting unit.
Minor leaks can be detected using an electronic leak detector or UV leak detector lamp.
Many methods for detecting leaks in the refrigerant circuit are offered in the open market. These methods do not always have optimum results. If they are not used exactly according to specifications, they can indicate refrigerant circuit components have leaks even when they do not. Also, refrigerant circuit components can be damaged by some methods.
Do not repair components with leaks. Replace them with new original parts.
Do not charge a leaking refrigerant circuit with refrigerant. Evacuate the circuit and check it for leaks before charging. Refer to → Chapter „Refrigerant Circuit with A/C Service Station, Draining“.
  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
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, even by flushing.
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.
  Note
Minor leaks can be detected using an electronic leak detector for example.
–  Discharge the refrigerant circuit with the A/C service station. Refer to → Chapter „Refrigerant Circuit with A/C Service Station, Draining“.
  Note
Be ready to evacuate a large leak should one be found. Refer to → Chapter „Refrigerant Circuit with A/C Service Station, Draining“.
If no leak is found during evacuation or there is a leak that is so small that the location cannot be found, proceed as follows. Refer to → Chapter „Searching for Refrigerant Circuit Leaks with Compressed Air or Nitrogen“.
Currents of air quickly disperse refrigerant gas. Draughts must therefore be avoided during leak detection.
If the refrigerant circuit is completely empty, fill with refrigerant to approximately 10% of the fill capacity (R134a label or vehicle-specific Repair Manual).
Leak detection:
–  Start up leak detector in line with relevant operating instructions.
–  Always hold test probe beneath suspected leak.
   
Depending on the model, leak detection is indicated by an increase in clicking rate or a warning tone. Refer to operating instructions for leak detector.
 

Refrigerant Circuit, Tracing Leaks, with Electronic Leak Detector -VAG1796

Searching for Refrigerant Circuit Leaks with Compressed Air or Nitrogen
  Note This repair manual describes different methods for detecting leaks in the refrigerant circuit. These methods have been tested and result in ...

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  Note This repair manual describes different methods for detecting leaks in the refrigerant circuit. These methods have been tested and result in ...

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