Refrigerant Circuit Switches, Sensors, and Related Connections: Notes

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Refer to vehicle-specific refrigerant circuit for switching pressures, switch removal/installation and switch layout/design → 87 - Air conditioning .

Fig 1: A/C Refrigerant High Pressure Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

A/C Refrigerant High Pressure Switch F23

Function:

Switches coolant fan up to next speed setting in the event of pressure increase (approx. 16 bar) in refrigerant circuit.

Fig 2: A/C Refrigerant High Pressure Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

A/C Refrigerant High Pressure Switch F118

Function:

Switches off compressor in the event of excess pressure in the refrigerant circuit (approx. 32 bar).

Fig 3: A/C Refrigerant Low Pressure Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

A/C Refrigerant Low Pressure Switch F73

Function:

Switches off compressor in the event of pressure drop in the refrigerant circuit (approx. 2 bar).