Inside Temperature Sensor

WARNING: This page is about a different car, the 1996 Buick Roadmaster. However, it is still accessible from the selected car via links, so may be relevant.

Inside temperature sensor is a thermistor located on top of instrument panel above glove box. Temperature sensor fits inside a short horizontal tube connected to an aspirator on the evaporator module. Inside air is drawn over thermistor providing a constantly updated inside air temperature signal to A/C-heater control panel.

As temperature decreases, resistance increases or vice versa. Resistance of sensor varies from 100,701 ohms at -40°F (-40°C) to 282 ohms at 185°F (85°C). A/C-heater control panel supplies a 5 volt reference voltage to thermistor and measures the voltage drop to determine inside temperature. A/C-heater control panel uses inside temperature signal to determine changes in mode, blower motor speed, or temperature air valve position.