2002 Cadillac Seville Owner's Manual - Page 177

If your vehicle is sitting in direct sunlight on a hot day and you have the climate control system in AUTO, the air will first flow out the floor ducts for a few seconds. This is normal. This removes hot air from the air outlets. As the air is cooled, the airflow will enter the vehicle through the instrument panel outlets. To avoid blowing cold air in cold weather, the system will start at a reduced fan speed until warm air is available. The length time required for this to happen 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 ducts, with some airflow to the windshield to prevent fogging under most normal conditions. If you select defrost mode or a fan speed manually, this function will be canceled. If you leave your vehicle, the system will remember the control setting the next time you start your engine, except for recirculation and defrost. Each ignition cycle cancels recirculation. Defrost will change to automatic operation when the ignition is shut off and then turned back on. Electronic Solar Sensor The sensor monitors the sun's solar radiation and is located near the end of the instrument panel near the windshield. The climate control panel 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 put anything over the electronic solar sensor. If you do, the climate control system may not function properly. 3-5