Audi Q3: System Overview - Refrigerant Circuit

HD = High-pressure end

ND = Low-pressure end

1 - A/C Compressor Regulator Valve -N280-

• To check, refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function, → Chapter "A/C Compressor Regulator Valve -N280-, Checking Switch-On Signal" and → Wiring diagrams, Troubleshooting & Component locations.

  Note

• Certain functions on the A/C Compressor Regulator Valve -N280- (for example, a stuck valve or a disruption in the coil) can lead to a complaint regarding the A/C compressor (A/C system doesn't cool, the evaporator ices over, etc.). If the cause is with the A/C Compressor Regulator Valve -N280- (and not the A/C compressor itself), the A/C compressor can be serviced by replacing the A/C Compressor Regulator Valve -N280-. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant Circuit Components, Replacing (Refrigerant R134a, Servicing; Refrigerant Circuit Components, Replacing).
• The A/C Compressor Regulator Valve -N280- is not available as a replacement part for all A/C compressors. If the A/C Compressor Regulator Valve -N280- is not available as an individual A/C compressor part (different versions), then the entire A/C compressor must be replaced. Refer to the Parts Catalog.

2 - A/C Compressor

• Overview. Refer to → Chapter "Overview - A/C Compressor Power Unit".

3 - Pressure Relief Valve

  Caution

Danger due to refrigerant coming out under pressure when there is a defective valve.

Danger of frost bite to skin and other parts of the body.

Only remove when the refrigerant circuit is empty. The connection does not have a valve.

4 - Oil Drain Plug

5 - Sealing Cap

• With seal
• Always to be screwed on

6 - Low Pressure Side Service Connection

• for measuring and emptying

  Caution

Danger due to refrigerant coming out under pressure when there is a defective valve in the refrigerant circuit.

Danger of frost bite to skin and other parts of the body.

Only remove when the refrigerant circuit is empty. The connection does not have a valve. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; A/C System, General Information (Refrigerant R134a Servicing; A/C System, General Information).

7 - Evaporator

8 - Expansion Valve

• Overview. Refer to → Chapter "Overview - Condenser, A/C Compressor, Expansion Valve, Refrigerant Line".

9 - High Pressure Sensor -G65-

• To check, refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function, → Chapter "High Pressure Sensor -G65-, Checking Pressure Signal" and → Wiring diagrams, Troubleshooting & Component locations.
• Removing and installing. Refer to → Chapter "High Pressure Sensor -G65-, Removing and Installing".

10 - Connection with Valve

11 - Condenser

• Overview. Refer to → Chapter "Overview - Condenser, Dryer Cartridge".

12 - Receiver/Dryer

• The receiver/dryer is integrated in the condenser.

13 - High Pressure Side Service Connection

• for measuring, emptying and filling

  Caution

Danger due to refrigerant coming out under pressure when there is a defective valve in the refrigerant circuit.

Danger of frost bite to skin and other parts of the body.

Only remove when the refrigerant circuit is empty. The connection does not have a valve. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; A/C System, General Information (Refrigerant R134a Servicing; A/C System, General Information).

14 - Sealing Cap

• With seal
• Always to be screwed on

15 - Belt Pulley

• Replace. Refer to → Chapter "Overview - Belt Pulley".
• Currently the belt pulley for the "Delphi" A/C compressors cannot be removed separately.

  Note

The A/C compressor on vehicles with a 5-cylinder engine (Audi RS Q3) have two ribbed belts. The A/C compressor has a belt pulley with a double belt guide.

READ NEXT: