Audi A4 Owners & Service Manuals

Audi A4: A/C System, General Information



The purpose of this repair manual is to provide service advisors and technicians with the basic knowledge needed to ensure professional and competent procedures.   Note Only the careful study

 A/C Technology Basic Principles

Physical Principles The four known states of water also apply to air conditioning system refrigerants. 1 - Gaseous (invisible) 2 - Vapor 3 - Liquid 4 - Solid

 Refrigerant R134a

Refrigerant R134a Physical Data Vehicle air conditioning systems make use of the vaporization and condensation process. In this case, one works with a substance which boils easily, designated as ref


 A/C Pressure/Temperature Sensor

There are different versions of this sensor with different functions and with different names. For exact name, allocation and notes doe the respective function, refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; Refrigerant Circuit; System Overview - Refrigerant C

 Battery Charger -VAS5903- Support Mode

General Information The support mode provides the vehicle electrical system with voltage when the Battery -A- is removed or disconnected. For more information. Refer to the Battery Charger -VAS5903- Operating Instructions. The support mode is used for the following situations: Vehicle electrical

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