Audi A4 Owners & Service Manuals

Audi A4: Service Station, Connecting with Connections on Low- and High Pressure Side of Refrigerant Circuit

Audi A4 (B9) 2016-2024 Service Manual / Heating, Ventilation & Air Conditioning / A/C Service Station, Connecting / Service Station, Connecting with Connections on Low- and High Pressure Side of Refrigerant Circuit

Servicing Station, Connecting for Measuring and Testing

- Turn off the ignition.

- Connect the service station to the power supply.

- Connect the quick-release coupling adapter to the charging hoses of service station (handwheels not screwed in/hand shut-off valve not open).

- Switch on the service station and evacuate the charging hoses (only necessary if there is air in charging hoses).

- Switch on the A/C service station.

- Remove the caps from the service connections (with valve).

- Connect the service station via the service connections with the quick-release coupling adapters to the vehicle refrigerant circuit.

- Screw in the handwheel of the quick-release coupling adapters only until the valves are definitely open at the refrigerant circuit connection (observe pressure gauge, do not strain valves).

On vehicles with high-voltage system and additional functions of the A/C system (for example on Audi Q7 e-tron):

  Note

On vehicles with the "heat pump" function and/or "high-voltage battery cooling" in not all operating conditions is the A/C system high pressure on the service connection of the high pressure side. The refrigerant circuit pressure on the high pressure side can on these vehicles depending on the operating conditions of the A/C system, can only be measured via the pressure/temperature sensor installed in the refrigerant circuit. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; Refrigerant Circuit; System Overview - Refrigerant Circuit and the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

To check the different functions of these A/C systems

- Select the respective function ("cooling the vehicle interior", "heat pump operation" or "cooling the high-voltage battery") via the Vehicle Diagnostic Tester and perform the respective specifications using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

- Select the measured values of the different pressure/temperature sensor installed in the refrigerant circuit and read out. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

All Vehicles

- Perform the planned tests and measurements.

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