Grand Cherokee 2WD V8-5.2L VIN Y (1998)
Solar Sensor: Description and Operation
Solar Sensor
Models equipped with the optional Automatic Temperature Control (ATC) system have a solar sensor. The solar sensor is mounted in the cowl top
trim panel, on the top of the instrument panel near the passenger side defroster outlet. The sensor is a photo diode which responds to sunlight
intensity, not to temperature.
The ATC control module uses the solar sensor input to calculate and compensate for the potential effects of heat gain in bright sunlight, and heat
loss with an overcast sky or at night. It then adjusts the blower motor speed, blend air door position, and mode door position as needed to maintain
the selected comfort level.
The solar sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
