Four Seasons A/C Evaporator Temperature Sensor Switch

The Four Seasons A/C evaporator temperature sensor switch, also called an A/C evaporator temperature sensor or thermistor, monitors the temperature of the evaporator core in your vehicle's air conditioning system. It sends a signal to the HVAC control module or compressor clutch circuit. The system uses that signal to cycle the compressor on and off, which helps prevent evaporator icing and keeps cooling consistent.

Key Features:

• Monitors evaporator core temperature to help prevent freeze-up and protect the A/C system
• Helps maintain steady, comfortable cabin cooling
• Helps the compressor cycle efficiently, reducing unnecessary wear
• Designed as a direct-replacement part for the original sensor
• Backed by Four Seasons, a long-established supplier of A/C and engine cooling components

A failing evaporator temperature sensor can cause weak or inconsistent cooling, compressor short-cycling, or an evaporator that freezes over. Replacing it restores proper A/C control. Select the correct variant from the options on this page.