Evaporator Temperature Sensor / Switch: Testing and Inspection

A/C THERMOSTAT

Connect battery power to the C terminal, ground the B terminal, and connect a test light between the A and B terminals.

NOTE: Use a 12 V, 3 W - 18 W test light.

Dip the A/C thermostat into a cup filled with ice water, and check the test light.

The light should go off at 36 - 39 °F (2 - 4 °C) or less, and should come on at 39 - 41 °F (4 - 5 °C) or more.

If the light doesn't come on and go off as specified, replace the A/C thermostat.