Audi A4 Owners & Service Manuals

Audi A4: Assist systems

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 General information

Safety precautions WARNING As the driver, you are always completely responsible for all driving tasks. The assist systems cannot replace the driver's attention. Give your full attention to drivin

 Driving information

 Speed warning system

Description Applies to: vehicles with speed warning system The speed warning system helps the driver to stay below a specified maximum speed. A warning threshold can be set in the MMI for this purpo

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 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 refrigerant. The refrigerant used is tetrafluoroethane R134a, which boils at -26.5 ºC (-15.7 ºF) at

 General Information

High pressure side are the condenser, receiver/dryer and restrictor or expansion valve to separate the high and low pressure liquid ends. High pressure results from the restrictor or expansion valve forming a constriction and causing the refrigerant to accumulate, thus leading to an increase in

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