Refrigerant Pressure Sensor / Switch: Description and Operation

A/C Pressure Switch F129







- Switches A/C compressor clutch off (between terminals T4a/1 and T4a/2) if system pressure is too low (low refrigerant charge).
- Switches A/C compressor clutch off (between terminals T4a/1 andT4a/2) if system pressure is too high
- Switches coolant fan to stage 2 (between terminals T4a/3 and T4a/4) if system pressure increases.