Coolant Temperature Sensor / Switch HVAC: Testing and Inspection

INSPECTION

1. Ignition "OFF".
2. Disconnect water temperature sensor connector.
3. Using the multi-tester, Measure resistance between terminal "1" and "2" of water temperature sensor.
4. If the measured resistance is not specification, substitute with a known-good water temperature sensor and check for proper operation.




5. If the problem is corrected, replace the water temperature sensor.