Cabin Temperature Sensor / Switch: Description and Operation

In Car Temperature Sensor









Cabin air is drawn through a grille (located near the steering column on the knee bolster) over a thermistor. Remotely mounted from the thermistor is the motorized aspirator with a rubber hose which connects both components.

The electrical resistance of the thermistor changes in response to variations in air temperature and converts this temperature rating into an electrical signal; the signal is used by the A/CCM to adjust the temperature, airflow and air distribution from the air conditioning unit.

The motorized in-car aspirator:
- Is located behind the driver's knee bolster.
- Has a motor-driven fan which draws in air through a small grille on the driver's knee bolster.
- Provides an input to the air conditioning control module to maintain a constant air outlet temperature when air conditioning is selected.