Refrigerant Circuit, Discharging with A/C Service Station

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Work procedure may vary depending on the type of tools selected (follow tool-specific operating instructions).

The refrigerant circuit is to be discharged if parts of the refrigerant circuit are to be removed, if there is any doubt about the quantity of refrigerant in the circuit or if safety precautions so require.

All the necessary usage information for working with the refrigerant A/C service station can be found in the A/C service station operating instructions.

Discharging:

Switch off ignition.

Connect A/C service station in line with operating instructions to vehicle service connections (refer to vehicle-specific refrigerant circuit) and start up A/C service station → 87 - Air conditioning .

NOTE:

There is a possibility of refrigerant oil being extracted from the refrigerant circuit together with the refrigerant. To ensure compressor lubrication, the refrigerant oil in the circuit must be topped up with fresh oil → Refrigerant R134a/Refrigerant Oil Capacities and Specifications .
On vehicles equipped with a compressor with no A/C clutch (with A/C Compressor Regulator Valve N280 ), the engine should not be run for longer than absolutely necessary with the refrigerant circuit empty and high engine speeds are to be avoided (compressor always in operation as well).
On vehicles with a compressor with no A/C clutch, the engine is only to be started following complete assembly of the refrigerant circuit (avoid high engine speeds).