Evaporator Temperature Sensor / Switch: Testing and Inspection

INSPECTION

AIR MIXING DAMPER CONTROL MOTOR CHECK

CAUTION:
Do not apply battery voltage when the damper is in the MAX COOL or MAX HOT position.





Check the air mix damper control motor by the following procedures.






POTENTIOMETER CHECK

While checking the air mix damper control motor, measure the resistances between terminals numbers 3 and 5 and between numbers 3 and 7. At this time, the resistances should change gradually within the standard value.

Standard value: 1.7 (MAX HOT) - 5.0 (MAX COOL) kohms


AIR THERMO SENSOR INSPECTION





Measure the resistance between connector terminals 1 and 2 under at least two different temperatures. The resistance values should generally match those in the graph.
NOTE:
The temperature at the check should not exceed the range in the graph.