Evaporator Temperature Sensor / Switch: Description and Operation

SYSTEM OPERATION
The evaporator probe is a temperature sensing element indicated at the coldest point on the face of the evaporator. Output from the probe is sampled by the Powertrain Control Module. It is used to switch the clutch OFF before evaporator freeze-up occurs. The clutch is switched OFF when the probe temperature reaches 1.1°C (34°F). It is allowed to switch ON when the probe temperature reaches 3.5°C (40°F).