Evaporator Temperature Sensor: Operation
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
Output from the probe is sampled by the HVAC control module. The A/C compressor clutch is switched OFF/ON when the probe temperatures are near 0°C (32°F).
NOTE:
Hysteresis and OFF/ON temperatures vary depending on the blower speed and software algorithm.
The evaporator temperature sensor prevents condensate water on the evaporator coil from freezing and obstructing A/C system air flow. The evaporator temperature sensor is non-repairable, and must be replaced if found faulty.