Coolant Temperature Switch for Powertrain Management in D50/Power Ram 50 (1992)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Coolant Temperature Switch
Air Conditioning Circuit
PURPOSE
The coolant temperature switch transmits an "A/C ON" signal to the ECU.
LOCATION
The coolant temperature switch is mounted in the thermostat housing.
OPERATION
When the engine coolant temperature is below 239° F, the bimetal strip inside the switch completes the circuit. This allows the ECU to determine
if conditions are suitable for A/C operation. When the coolant temperature exceeds 235° F, the bimetal strip inside the switch opens circuit. This
prevents the signal from being sent to the ECU.
