300SDL (126.125) L6-3.0L DSL Turbo (603.961) (1987)
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.