2002 Cadillac DeVille Owner's Manual - Page 207

To avoid blowing cold air in cold weather, the system will start at reduced fan speeds until warm air is available. The length of reduction depends on the outside air temperature, engine coolant temperature or the time since the engine was last started. As the coolant warms up, the fan speed will gradually increase and air will flow from the floor outlets, with some airflow to the windshield to prevent fogging under most normal conditions. If you select defrost mode or a fan speed, this function will be skipped and the system will be in manual mode. If you leave your vehicle, the system will recall the control setting the next time you start your engine, except for recirculation and defrost. Electronic Solar Sensor The sensor monitors the sun's solar radiation. It is located on top of the instrument panel near the windshield. When the climate control system is in AUTO, the system uses this information to automatically make the necessary temperature and airflow adjustments to maintain your comfort. The climate control system may supply cooler air to one side of your vehicle, if that side is facing the sun. Be sure not to cover the sensor on top of the instrument panel. If you do, it will not work properly. 3-5