1999 Cadillac DeVille Owner's Manual - Page 164

yellowblue 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, whereas, DEFROST will change to automatic operation when the ignition is shut off and then turned back on. Manual Operation You may manually adjust the air delivery mode or fan speed. AC: This setting directs airflow through the middle instrument panel outlets. BI-LEVEL: This setting directs air into your vehicle in two ways. Cool air is directed to the upper portion of your body through the four instrument panel outlets while warmed air is directed to the floor. HEATER/DEFROST: This setting directs air to the floor outlets and toward the windshield. HEATER: This setting directs warmed air through the floor outlets. Some warm air is diverted to the windshield to minimize fogging. DEFROST: Press this button to quickly remove fog or frost from the windshield. This setting sends most of the airflow to the windshield with only a small amount to the floor outlets. FAN SPEEDS: Press the button with the fan symbol on it until AUTO is displayed on the screen. At this setting, the fan speed is automatically controlled. If it is cold outside, the blower may not run in the maximum high fan speed right away. The system checks the temperature of the engine coolant to assure it is warm enough to provide heat. When the engine coolant is warm, the controller allows the fan to gradually increase to a higher speed. This prevents cold air from blowing into the passenger compartment. If you want the blower fan at a high speed, press the up arrow button until you see HI on the display. If you want the fan speed to be automatic, but you like the fan speed to be higher than the AUTO setting, press the fan symbol button until HI AUTO is shown on the display. If you want the blower fan at a low speed, press the down arrow button until LO is shown on the display. If you want the fan speed to run lower than the AUTO setting, press the button until LO AUTO is shown on the display. 3-8