DeVille d Elegance V8-4.6L VIN Y (1998)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C Low Pressure Switch
The low pressure switch is located in the low pressure refrigerant line. When pressurized, the switch is closed and allows the compressor clutch relay to
energize, feeding battery voltage to the compressor clutch coil. If the pressure drops below 69 kPa (10 psi), the switch opens and cuts off voltage to the
clutch. There is a circuit to the heater and A/C programmer which monitors the state of the switch for diagnostic purposes.
