Evaporator Temperature Sensor / Switch: Testing and Inspection

REMOVAL AND INSPECTION OF THERMISTOR

1. Disconnect negative cable from battery.
2. Remove glove box and under cover.
3. Check thermistor installed operation. Using an ohmmeter, measure the resistance at the connector.
Resistance: 1,500 Ohms at 25°C (77°F)

If the resistance is not as specified, replace the thermistor.

4. Remove thermistor.
a. Disconnect the connector.
b. Remove the screw and thermistor from the cooling unit.
5. Check thermistor operation.
a. Place the thermistor in cold water. While varying the temperature of the water, measure the resistance at the connector and at the same time, measure the temperature of the water with a thermometer.
b. Compare the two readings on the chart.

If the intersection is not between the two lines, replace the thermistor.