PRESSURES, CHECKING, VEHICLES WITH EXPANSION VALVE, RECEIVER/DRYER AND A/C Compressor Regulator Valve -N280-, EXTERNALLY REGULATED COMPRESSOR: Notes

WARNING: This page is about a different car, the 2023 Audi SQ8, 2023 Audi RS Q8, and 2023 Audi Q8. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Connect the 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 the pressures and the A/C system cooling output again; if the complaint still exists, replace the expansion valve that is prematurely switched by the questioned evaporator. Refer to Refrigerant Circuit (vehicle-specific service information).

-- With the ignition switched off, check the pressures in the refrigerant circuit (using the A/C service station). Refer to 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 A/C service station.

NOTE:

The switching pressures for activation of A/C Compressor Regulator Valve -N280- and Radiator Fan -V7- are vehicle-specific.

Pressures must be measured at the service connections; the component location for these connections are vehicle-specific. Refer to Refrigerant Circuit (vehicle-specific service information).