Heater Core Temperature Sensor / Switch: Description and Operation

The heater core temperature sensor measures the temperature of the heated air downstream of the heater core separately for the left and right sides.

The heater core temperature sensor is a temperature-dependent resistor. The measured resistance is transferred to the pushbutton control module. Here the reading (actual value) is compared with the temperature set on the pushbutton control module.

Each temperature setting is associated with a resistance (nominal value). The pushbutton control module determines the opening time for the monovalve by comparing the actual value and settings.