1999 Cadillac DeVille Owner's Manual - Page 168

yellowblue Ventilation System Your vehicle's flow-through ventilation system supplies outside air into the vehicle when it is moving. Outside air will also enter the vehicle when the heater or the air conditioning fan is running. The front outlets are located in the center and at each side of the instrument panel. You can adjust the direction of airflow by moving the center control levers or you can stop the airflow by moving the lever located on each side of the outlets downward. The direction of airflow to the rear seats can be adjusted if you have the optional full console (DeVille Concours only). Move the fan lever to adjust the blower speed from low to high. Move the vent lever to direct the airflow. 3-12