Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
A/C Pressure Sensor/Switch - Cooling Fan: Description and Operation
A/C Pressure Switch F129
This pressure switch has 3 functions:
1. Switches coolant fan to next higher stage upon pressure increase in refrigerant circuit (approx. 16 bar).
2. Switches off A/C system if pressure is excessive (approx. 32 bar), e.g. because of insufficient engine cooling.
3. Switches off A/C system if pressure is insufficient (approx. 2 bar), e.g. loss of refrigerant.
Note:
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A/C Pressure Switch F129 replaces the A/C Refrigerant High Pressure Switch F23, A/C Refrigerant Low Pressure Switch F73 and the A/C
Refrigerant High Pressure Switch F118.