Flex AWD V6-3.5L (2009)
Evaporator Temperature Sensor / Switch: Description and Operation
Air Conditioning
Air Conditioning
Evaporator Discharge Air Temperature Sensor
The evaporator discharge air temperature sensor contains a thermistor. The resistance of this thermistor varies by a specific amount based on the
evaporator discharge air temperature. The HVAC module measures a voltage ratio between the reference voltage it supplies to the sensor and the sensor
voltage to determine this resistance and the associated discharge air temperature.
The evaporator discharge air temperature sensor maintains evaporator core temperature and prevents icing of the evaporator core. The temperature
information from the sensor is used by the HVAC module to switch off the A/C request signal to the Instrument Cluster (IC) when the evaporator
discharge air temperature falls below acceptable levels (slightly above the freezing point of water). The A/C request will be switched back on when the
evaporator discharge air temperature rises above acceptable levels.
The evaporator discharge air temperature sensor can be accessed from below the LH side of the instrument panel to the right of the accelerator pedal.
