1998 Cadillac DeVille Owner's Manual - Page 171

To avoid blowing coldair in cold weather, the systemwl il delay turning on thefan until warm air is available. The length of delay depends on the outside temperature, air engine coolant temperature or the time since the engine With the automatic setting, the air conditioning was last started.As the coolant warrns up, the blower fan compressor automatically cycles when needed to cool air speed will gradually increase and will flow from the the air. In cold weather, when the system senses the need for heat, the airflow will be directed out the floor heater outlets, with some airflow to the windshield to outlets. As the interior temperature approaches a desired prevent fogging under most normal conditions. To setting, the blower speed will decrease. maintain If you leave your vehicle, the system will remember the interior comfort, the airflow may move to the instrument control setting the next time you start your engine, panel air outlets and floor outlets (bi-level mode). On except for recirculation and defrost. Each ignition cycle bright sunny days in cold weather, airflow may come the cancels recirculation, whereas, DEFROST will change (AC out of the air conditioning outlets mode) to to automatic operation when the ignition shut off and is maintain comfort and prevent stuffiness. then turned back on. To find your comfort zone, start with the "F (24°C) 75 setting and allow about minutes for the system to 30 regulate. Press the red blue temperature buttons or to adjust the temperature if necessary. you choose If 60°F (16"C), the system will remain at that maximum will If cooling setting and not regulate fan speed. you choose the temperature of90°F (32"C), the system will remain at that maximum heating setting and will not regulate fan speed. Choosing either maximum setting will not cause the system to heat or cool any faster. out If your vehicle is sitting on a hot day and you have it set onAUTO, the air willfirst flow out the floor air This outlets for a few seconds. That is normal. is to As expel hot air from the air outlets.the air is cooled, the airflow will move through the air conditioning fan outlets. If you start your vehicle with the setting on HI, it will skip the air conditioning purge.