Evaporator Temperature Sensor: Description
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.
The evaporator temperature sensor is a temperature sensing element located at the coldest point on the face of the evaporator. Output from the probe is sampled by the HVAC Control Module. The evaporator temperature sensor is used to switch the A/C compressor clutch OFF before evaporator freeze-up occurs.