A/C Pressure Switch -F129-

WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

This pressure switch has three functions:

Fig 1: A/C Pressure Switch - F129

Courtesy of AUDI OF AMERICA, LLC

1. Switches the radiator fan to the next higher level when the pressure in the refrigerant circuit increases (approximately 16 bar (232.06 psi)).

2. Switches off the A/C system if the pressure (approximately 32 bar (464.12 psi)) is excessive (for example, due to insufficient engine cooling).

3. Switches off the A/C system if the pressure (approximately 2 bar (29.01 psi)) is insufficient (for example, loss of refrigerant).

NOTE:

The 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-.