General Information

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2015 Audi S4, 2015 Audi A4 Quattro, and 2014 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Connect the Air Conditioning (A/C) service station. Refer to A/C SERVICE STATION, CONNECTING .

Observe the test requirements. Refer to PRESSURES, CHECKING .

If a malfunction occurs at only one evaporator in vehicles with two evaporators, also check pressures in the refrigerant circuit, are these OK? Check the line connection between the evaporator in question and the exit of line connection at distribution point of refrigerant lines (for constriction). If no malfunction can be detected, discharge the refrigerant circuit and charge it with the specified refrigerant quantity. Then check pressures and cooling performance of A/C system again; if the malfunction occurs again, replace the expansion valve which is prematurely switched by the malfunctioning evaporator. Refer to OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

-- With the ignition switched off, check the pressure in the refrigerant circuit (using the service station). Refer to REFRIGERANT CIRCUIT, CHECKING PRESSURE WITH SERVICE STATION .

The pressures with the ignition turned off meet the specifications.

-- Start the engine.

-- Bring the engine speed up to 2000 RPM.

-- Observe the pressure gauge of the service station.

NOTE:

Switching pressures for actuation of A/C Compressor Regulator Valve -N280- and Radiator Fan -V7- are vehicle-specific.

Pressures must be measured at service connections; component locations of these connections are vehicle-specific. Refer to OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).