Heater Core Temperature Sensor / Switch: Description and Operation

Heat Exchanger Temperature Sensor:

PURPOSE

The heat exchanger temperature sensor sends heating temperature information to the push-button control unit. This information, along with information provided by the interior temp. sensor, is used to calculate necessary correction for maintaining interior temperature.

LOCATION

Heat Exchanger Temp. Sensor Location:

The heat exchanger temperature sensor is located behind the ACC control unit, at the front of the heater box.

OPERATION

The temperature of the heating air within the heater box produces a resistance value in the sensor circuit. The resulting current flow in the sensor circuit is recognized by the ACC control unit as a measurement of the evaporator temperature. Together with the interior sensor and heater temperature senor, the potentiometer in the ACC control unit produces a nominal value for temperature control.