Regal V6-231 3.8L VIN L SFI (1990)
Refrigerant Pressure Sensor / Switch: Description and Operation
Pressure Cycling Switch
A/C PRESSURE CYCLING SWITCH
The A/C pressure cycling switch is closed when there is sufficient refrigerant charge. When the A/C control switch is turned "ON" and the pressure
cycling switch is closed, a request signal is sent to the ECM, which energizes the A/C control relay. When the ECM senses this signal it will also turn
"ON" the cooling fan.