Evaporator Temperature Sensor / Switch: Testing and Inspection

On Vehicle Inspection

1. Remove the glove box.
2. Run the engine at idle.





3. Turn OFF the A/C switch and set the blower switch to the highest position to operate the blower fan for a few minutes.
4. After a few minutes, turn OFF the blower switch and stop the engine. Go to Step 5.








5. Disconnect the A/C thermostat connector and check for continuity between terminals of the switch.
6. If not as specified, replace the A/C thermostat.

NOTICE
The A/C thermostat contacts will be open if the evaporator temperature is below 32.7 ± 1.3°F (0.4 ± 0.7 ° C).

Off Vehicle Inspection

1. Immerse the sensing bulb in a container of ice water.
2. Check continuity between terminals of the switch as specified.








3. If not as specified, replace the A/C thermostat.