Evaporator Temperature Sensor / Switch: Description and Operation

SYSTEM OPERATION
Evaporator Probe
The Evaporator probe is located on the HVAC. The probe prevents evaporator freeze-up by signaling the Powertrain Control Module to cycle the compressor ON and OFF. The probe monitors the temperature of the refrigerant after expansion.

The evaporator probe is inserted into the evaporator between the coils. The probe is a sealed unit and cannot be adjusted or repaired. It must be replaced if found defective.