Audi A4 Owners & Service Manuals

Audi A4: Refrigerant Circuit Components, Replacing

Audi A4 (B9) 2016-2026 Service Manual / Heating, Ventilation & Air Conditioning / Refrigerant Circuit Components, Replacing

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 General Information

Vehicles with a High Voltage System (Hybrid Vehicles) Extremely Dangerous Due to High-Voltage The high-voltage system is under high-voltage. Death or serious bodily injury by electric shock. - I

 Leaking or Damaged Components except A/C Compressor, Reservoir or Receiver/Dryer

The refrigerant circuit was completely empty (for example with larger leak or cracked hose)   Note In the event of only a minor leak with slow escape of refrigerant (e.g. at a small leakage

 Compressor, Replacing without the Need for Flushing Refrigerant Circuit

  Note Cleaning the refrigerant circuit means flushing with refrigerant R134a. Refer to → Chapter "Refrigerant Circuit, Cleaning (Flushing), with Refrigerant R134a". If a faulty A/C

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 Control Module/Digital Sound System Amplifier, Removing and Installing

Special tools and workshop equipment required Fiber-Optic Repair Set - Connector Protective Caps -VAS6223/9-. The Digital Sound System Control Module -J525--1- is located behind the left luggage compartment side trim panel.   Note If replacing the control module, select the "Replace contr

 Refrigerant Circuit Complaints

Possible Refrigerant Circuit Concerns Test Requirements Electrical Equipment, vacuum system and air duct fault-finding has not revealed any faults. Refer to Guided Fault Finding for the A/C system ("OBD" or "Guided Fault Finding for the A/C system"), → Wiring diagrams, Troubleshooting &

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