Heater Core Temperature Sensor / Switch: Description and Operation

Heater Matrix Temperature Sensor





The heater matrix temperature sensor is a thermistor which changes its electrical resistance in response to changes in air temperature converting a temperature rating to an electrical signal.

The sensor connector is located on the RH SIDE of the air conditioning unit. The sensor bead is located inside the unit down-stream from the heater matrix and measures the 'post-heater' air temperature, before the air is distributed to the cabin The sensor provides a signal to the A/CCM which adjusts the duty ratio of the water valve to provide the required air temperature from the heater.