Heater Core Temperature Sensor / Switch: Testing and Inspection

Heat Exchanger Temperature Sensor:

1. Remove heater core temperature sensor. Allow sensor to stabilize to ambient (room) temperature.
2. Connect ohmmeter across sensor pins and compare to specifications below.

Ambient (Room) Temperature
+15°C (+59°F) 15.7 ± 0.5 kohms
+25°C (+77°F) 10.0 ± 0.5 kohms
+35°C (+95°F) 6.5 ± 0.5 kohms
+80°C (+176°F) 1.5 ± 0.5 kohms