Audi A4 Owners & Service Manuals

Audi A4: A/C System, General Information

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 Introduction

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

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 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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