Ambient Temperature Sensor / Switch HVAC: 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.