Coolant Temperature Sensor / Switch HVAC: Testing and Inspection

Thermo sensor is located on coolant outlet hose in engine room. Not engine overheated, if engine coolant temperature is over 115° C, electrical current will not flow.




CHECKING
1. Immerse thermo sensor in engine coolant.
2. Using a stove, heating engine coolant, check that electrical current continues as shown.
below 115° C ................................... Continuity
over 115° C ................................. No continuity