Evaporator Temperature Sensor / Switch: Testing and Inspection

Evaporator Temperature Sensor Test

NOTE: Before testing the sensor, check for HVAC DTCs How To Troubleshoot The Heating and A/C Systems.

1. Remove the evaporator temperature sensor Service and Repair.

2. Dip the sensor in ice water, and measure the resistance between its terminals.





3. Then pour warm water on the sensor, and check for a change in the resistance.

4. Compare the resistance readings with the specifications shown in the graph; the resistance should be within the specifications.





5. If the resistance is not as specified, replace the evaporator temperature sensor Service and Repair.