Discharge Air Temperature Sensor / Switch: Description and Operation
EVAPORATOR DISCHARGE AIR TEMPERATURE SENSORThe evaporator discharge air temperature sensor communicates the evaporator discharge air temperature to the electronic manual temperature control HVAC module.
The PCM maintains evaporator core temperature and prevents icing of the evaporator core, by disengaging the A/C compressor clutch when the evaporator discharge air temperature sensor reading falls below acceptable levels, and by engaging the A/C compressor clutch when the discharge air temperature rises above acceptable levels.
The evaporator discharge air temperature sensor is located on the heater core and evaporator core housing in the air-stream leaving the evaporator core.