1999 Cadillac DeVille Owner's Manual - Page 161

yellowblue Manual Operation RECIRCULATION: Press this button to limit the amount of fresh air entering your vehicle. This is helpful when you are trying to cool the air quickly or limit odors entering your vehicle. In the AUTO mode, the system will use recirculation as necessary to cool the air. Pressing the recirculation button will change the operation to a manual mode and the air will recirculate non-stop. Press this button again to turn off the recirculation feature. If you notice the windows fogging, press the recirculation button to exit the recirculation mode. OFF: Press this button to turn the system off. Fresh air will continue to flow through the vehicle, and the system will try to maintain the previously set temperature. The outside temperature will show in the display when the system is off. DEFOG: Press this button to divide the air between the windshield and the heater outlets. This is useful when fog appears on the windshield or side glass due to sudden rain or snowy conditions. AUTO/ECON: Press this button to switch between AUTO and ECON. The ECON setting attempts to keep air at a selected temperature, however, it does not remove humidity from the air. Use this setting in cold or cool weather to save fuel. The AUTO setting is used when it's warm outside and you need to cool the air in order to maintain a selected temperature and blower speed. 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 AUTO LO is shown on the display. 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. 3-5