Audi A4 Owners & Service Manuals

Audi A4: A/C System Repair Information

  • Air conditioning systems designed for refrigerant R12 are only to be filled with refrigerant R134a if certain requirements are fulfilled. Refer to → Chapter "Refrigerant Circuit, Converting R12 to R134a and Servicing" and Repair manual: Air Conditioner with R12 Parts 2 and 3. This repair manual is only available in hard copy.
  • The refrigerant oils specifically developed for R134a and R12 refrigerant circuits are never to be mixed.
  • Service stations which come in contact with the refrigerant are only to be used for the intended refrigerant.
  • Components of R134a refrigerant circuits can be identified by their markings, green labels or design (such as different threads) to prevent interchanging with components designed for refrigerant R12.
  • A label indicating the refrigerant used is provided in the engine compartment on the lock carrier or in the plenum chamber.
  • Different refrigerants are never to be mixed.


When working on the refrigerant circuit, always heed the information given in the sections on "Safety measures". Refer to → Chapter "A/C System and Refrigerant R134a Safety Precautions" and "Basic rules for working on refrigerant circuit" → Chapter "Refrigerant Circuit, General Precautions".

Refrigerant Circuit, Converting R12 to R134a

CFC refrigerants are no longer used in the automotive industry.

Converting refrigerant circuits from R12 refrigerant to R134a refrigerant and servicing converted circuits

Refer to Repair Manual: Air Conditioner with Refrigerant R12 Parts 2 and 3 (This repair manual is only available in printed form).


     Using Service Station

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