Ambient 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.
Ambient (outside) temperature sensor is a thermistor located on radiator center support, just below hood latch. As temperature decreases, resistance increases or vice versa. Resistance of sensor varies from 100,701 ohms at -40°F (-40°C) to 667 ohms at 140°F (60°C). A/C-heater control panel supplies a 5 volt reference voltage to thermistor and measures the voltage drop to determine ambient temperature. A/C-heater control panel uses ambient temperature sensor signal to control amount of cooling or heating required to maintain selected temperature.