SUNLOAD 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.
Sunload sensor is located in left side of instrument panel defroster grille. Sensor is a reverse bias photo-diode which responds to sunlight by changing resistance. A/C-heater control panel supplies a 5 volt reference voltage to sunload sensor. The effect of the sensor in bright sunlight is like decreasing temperature setting 3 degrees.