Refrigerant Pressure Sensor / Switch: Description and Operation

A/C Pressure Sensor
The PCM monitors the refrigerant system high-side pressure through the A/C pressure sensor.
- A valve depressor, located inside the threaded end of the A/C pressure sensor, presses a Shrader valve stem on the compressor discharge line portion of the compressor manifold and tube assembly.
- The A/C pressure sensor provides a voltage that is proportional to the A/C compressor discharge pressure, which allows for the A/C compressor discharge pressure to be monitored by the PCM.
- The PCM uses this information for A/C clutch control, cooling fan control and idle speed. For specifications regarding operating pressures, refer to the Computers and Control Systems.
- It is not necessary to recover the refrigerant to remove the A/C pressure sensor.