Checking A/C pressure switch -F129-: Checking:
WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, 2000 Volkswagen Cabrio, 1999 Volkswagen Jetta, and 1999 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.
If A/C clutch -N25- does not engage with A/C ON:
- Start engine.
- Using a jumper wire, briefly bridge terminal 1 (T4a/1) and terminal 2 (T4a/2) of A/C pressure switch connector.
If A/C clutch -N25- now engages, refrigerant system is discharged (empty).
- Check A/C system for leaks, repair as necessary.
NOTE:
With A/C pressure switch -F129- removed and connector attached, A/C clutch -N25- should not engage and A/C should not cool.
- Protects refrigerant circuit from excessive pressure
- Pressure relief valve tell-tale indicates when valve has been actuated by excessive pressure (adhesive-attached plate (arrow) is pushed out). If so, repairs must be carried out by an A/C specialist.