Expedition 2WD V8-5.4L (2009)
Evaporator Temperature Sensor / Switch: Description and Operation
Air Conditioning
Air Conditioning
Evaporator Temperature Sensor
The evaporator temperature sensor communicates the evaporator fin temperature to the 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 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 temperature sensor electrical connector is located outside of the heater core and evaporator core housing behind the glove compartment,
with the sensor pigtail leading into the housing to the sensor probe which is inserted between the evaporator core fins.
The evaporator temperature sensor is not available as a separate component. To install a new evaporator temperature sensor, a new heater core and
evaporator core housing must be installed.
