Evaporator Temperature Sensor / Switch: Description and Operation
DESCRIPTIONThe evaporator probe is a temperature sensing element located at the coldest point on the face of the evaporator. The evaporator temperature sensor prevents condensate water on the evaporator core from freezing and obstructing A/C system air flow.
OPERATION
Output from the probe is sampled by the Body Control Module (BCM). It is used to switch the A/C compressor clutch off before evaporator freeze up occurs. The clutch is switch off when the probe reaches 0.94°C. (33.7°F.). It is allowed to switch on when the probe temperature reaches 2.05°C. (35.7°F.).