Engine Coolant Temperature Switch (A/C)

Engine Coolant Sensor Locations:

LOCATION

Engine coolant temperature sensor, located in the thermostat housing at the rear of the engine.

PURPOSE

Allows the "A/C ON" signal to be transmitted to the ECM. Used to prevent engine overheating by eliminating A/C operation.

OPERATION

When the engine coolant temperature is below 239° F, the bimetal strip inside the switch completes the circuit. Informing the ECM that conditions are suitable for A/C operation.

When the coolant temperature exceeds 235° F, the bimetal strip inside the switch opens circuit. Preventing the ECM from activating the A/C.