Audi A4 Owners & Service Manuals

Audi A4: Laws and Regulations

Refrigerant Circuit, Converting R12 to R134a and Servicing


  • For environmental reasons and on account of the corresponding legislation, refrigerant R12 can no longer be manufactured or supplied. Refrigerant R134a has been developed as a replacement for R12.
  • A/C systems developed and designed for refrigerant R12 cannot however simply be charged with refrigerant R134a. To ensure trouble-free operation of the air conditioning system even after conversion, various components of the refrigerant circuit must be replaced.
  • A precise description of the conversion procedure and information on the servicing of converted refrigerant circuits can be found in Repair Manual: Air Conditioner with Refrigerant R12 Parts 2 and 3. (This repair manual is only available in hard copy).

Refrigerant, Keeping Records

The environmental statistics law requires records to be kept on the use of refrigerants.

Consequently, motor vehicle workshops may well have to provide the relevant local authorities with information on their use of refrigerant. It is recommended to always keep a record sheet.


  • A record sheet no longer needs to be kept in the EU due to a provision by the European Parliament in 2005. A record sheet is currently necessary when a use of 50 kg or more in the year (see also Provision (EU) no.1005/2009).
  • It is recommended to keep a record sheet because the local authorities can request information regarding refrigerant use starting from a certain amount (currently starting with a use of 20 kg in a year).
  • Other provisions may apply in countries that are not members of the EU.


     Refrigerant Circuit

     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, Convertin

     Using Service Station



    Depending on the vehicle equipment, various parking aids will help you when parking and maneuvering. Parking aid The parking aid plus assists you while parking using audio and visual signals to warn you about objects detected in front of, behind, and next to* the vehicle. The rearview camera shows

     Subwoofer -R211-, Removing and Installing

    Subwoofer -R211-, Removing and Installing, Sedan The Subwoofer -R211- is located in the rear shelf. Removing - Turn off the ignition and all electrical equipment and remove the ignition key. - Remove the rear shelf. Refer to → Body Interior; Rep. Gr.70; Vehicle Interior

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