A/C Pressure Switch -F129-

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NOTE:

Switch pressures, removing and installing switches as well as switch arrangement and version. Refer to vehicle specific refrigerant circuit OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).

This pressure switch has 3 functions:

Fig 1: A/C Pressure Switch - F129

Courtesy of AUDI OF AMERICA, LLC

1. Switches the coolant fan to the next higher level when the pressure in the refrigerant circuit increases (approximately 16 bar (232 psi)).

2. Switches off A/C system if pressure is excessive (approximately 32 bar (464 psi)), e.g. because of insufficient engine cooling.

3. Switches off A/C system if pressure is insufficient (approximately 2 bar (29 psi)), e.g. loss of refrigerant.

NOTE:

A/C Pressure Switch -F129- replaces the A/C Refrigerant High Pressure Switch -F23-, A/C Refrigerant Low Pressure Switch -F73- and the Magnetic Clutch High Pressure Switch -F118-.