Audi A4 Owners & Service Manuals

Audi A4: Refrigerant Circuit, Charging with Service Station


The entire refrigerant charge can be added to either the high or low pressure side. Refer to → Chapter "Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils".

  • The work procedure is always to be performed as described in the operating instructions for the A/C service station.
  • Before pouring in refrigerant, correct the quantity of refrigerant oil. Refer to → Chapter "Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils".
  • Make sure the A/C Service Station is standing at the same level as the vehicle (maximum difference: 50 cm) when charging the refrigerant circuit. If a difference in height is large enough, a difference between the amount of refrigerant displayed on the service station and amount actually filled in the circuit will result (depending on the version of the A/C Service Station). The ability of the A/C Service Station to perform an exact filling can change.

- Turn off the ignition.

- Evacuate the refrigerant circuit using the service station. Refer to → Chapter "Refrigerant Circuit, Discharging with Service Station".

Additionally on vehicles with an electric operated valves in the refrigerant circuit, which cannot be opened without power (for example the Audi Q7 e-tron):


On vehicles with high-voltage system and additional functions of the A/C system ("heat pump operation" or "cooling the high-voltage battery") valves may be installed in the refrigerant circuit which cannot be opened without power. These valves are opened and closed for example via a step motor and after switching off the ignition are no longer activated. To completely drain, correctly discharge and charge the refrigerant circuit no areas may be closed, for this reason the valves must be opened before these procedures. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; Refrigerant Circuit; System Overview - Refrigerant Circuit and using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

- Open the electrically activated valves, which to now open without power using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.


- Screw out handwheel at quick-release coupling adapter (to close it).

- Allow an amount of refrigerant to flow into charging hose.

- Check the charging cylinder.

- Screw in hand wheel at the quick-release coupling adapter (to open it) and charge with the specified quantity of refrigerant.

- Turn off the service station.


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