Refrigerant: Description and Operation

Capacities

- Empty, evacuate and charge refrigerant circuit.

- Operate the A/C system after filling the refrigerant circuit. Refer to => [ A/C System, Operating after Filling Refrigerant Circuit ] A/C System, Operating After Filling Refrigerant Circuit.

• Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5).

• Depending on time period of production and on engine, compressor construction type may vary. Refer to Electronic Parts Catalog (ETKA).

• At start of production, mechanically driven A/C compressors manufactured by "Denso" (type "6 SEU 14") on 4 and 6 cylinder vehicles and type "7 SEU 17" on 8 cylinder FSI vehicles) were installed. Compressors from other manufacturers may also be installed at a later time. Refer to Electronic Parts Catalog (ETKA)

• Depending on the type of A/C compressor, different refrigerant oil capacities are intended for the refrigerant circuit. Refer to Electronic Parts Catalog (ETKA).

• Compressor as replacement part has different oil fill capacities, therefore note the exact part number. Refer to Electronic Parts Catalog (ETKA). The reason for the different oil capacities in the compressor is the design of the compressor itself, note these oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor.

• Always fill refrigerant circuit as far as upper tolerance limit (some refrigerant remains in filler hoses).

• Only approved refrigerant oils may be added to the refrigerant circuit. Refer to the Electronic Parts Catalog.

• Different refrigerant oils are required for A/C compressors made by Zexel / Valeo, Sanden and Denso. Refer to the Electronic Parts Catalog.

• Use only the specified refrigerant oil from a sealed container and always reseal oil container immediately after use (PAG oil absorbs moisture). Do not use refrigerant oil if it is contaminated with moisture or if the refrigerant oil container has been left open.

• There are different condenser versions. Check for the correct version and allocation before installing. Refer to => [ Condenser, Checking Version ] Testing and Inspection and to the Electronic Parts Catalog (ETKA). Pay attention to the correct fill capacity for the refrigerant R134a based on the condenser version.