High Pressure Cutoff Switch
WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The high pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
- The high pressure cutoff switch is mounted on a Schrader valve-type fitting on the high pressure side of the compressor manifold and tube assembly.
- A valve depressor, located inside the threaded end of the high pressure cutoff switch, presses on the Schrader valve stem.
- This allows the high pressure cutoff switch to monitor the A/C compressor discharge pressure.
- When the A/C compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor.
- It is not necessary to discharge the refrigerant system to remove the high pressure cutoff switch.