Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with A/C Service Station, Filling

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / A/C Service Station, Working with / Refrigerant Circuit with A/C Service Station, 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.

WARNING

High voltage within the high voltage system. Danger of electric shock in the A/C compressor!

Disable high voltage system. Refer to → Electric Drive; Rep. Gr.93.

The work procedure is always to be performed as described in the operating instructions for the A/C service station.

Before pouring in refrigerant, correct the quantity of refrigerant oil. Refer to → Rep. Gr.87.

The entire refrigerant charge can be added to either the high or low pressure side.

Refrigerant circuit, charging

–	Turn off the ignition.

–	Drain the refrigerant circuit with A/C service station. Refer to → Chapter „Refrigerant Circuit with A/C Service Station, Draining“.

–	Screw out handwheel at quick-release coupling adapter (to close it).

–	Allow refrigerant to flow into charging hose.

–	Tighten the handwheel on the quick-release coupling adapter without putting too much pressure on the valve and add the specified amount of refrigerant.

–	Switch off A/C service station.

Note

If A/C compressor was removed, it must be cranked by hand at ribbed belt pulley/freewheel approximately 10 rotations before bringing into operation for the first time. The electrically-driven A/C compressor is not affected by this. This prevents damage in the A/C compressor due to liquid when switching the A/C system on. If there is oil in the A/C compressor cylinder, it will be forced out.

–	Start engine with compressor switched off (version with A/C clutch).

–	Set the A/C compressor to minimum output, for example, "ECON" mode or A/C off (version with no A/C clutch with regulator valve).

–	Wait until idle speed has stabilized.

–	Switch on the compressor and operate the system for at least two minutes at idling speed.

–	If necessary, check pressures in refrigerant circuit using A/C service station.

–	Turn engine off.

–	Screw out handwheel on quick-release coupling adapter.

–	Disconnect charging hose from refrigerant circuit.

–	Screw protective caps back on.

Refrigerant Circuit with A/C Service Station, Draining

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A/C System, Operating after Charging

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