Evaporator Temperature Sensor / Switch: Testing and Inspection

A/C Thermo Switch





Dip A/C thermo switch into a pan filled with ice water, and check for continuity between the terminals.

Cut off: 1.5 - -O.5°C (35-33°F)
Cut in: 2.5 - 5°C (36 - 41°F)

If cut off or cut in temperature is too low or too high, replace the thermo switch.