1998 Cadillac DeVille Owner's Manual - Page 178

Ventilation System Your vehicle's flow-through ventilation system supplies outside airinto the vehicle when it is moving. Outside air will also enter the vehicle when the heater air or the conditioning fan is running. The front outlets are located in center and at each the side of the instrument panel.You can adjust the direction of airflow by movingthe center control levers or you can stop the aifflow moving the lever located by on eachside of the outlets downward. The direction of airflow to the rear seats be adjusted can if you have the optional full console (DeVille Concours Only). Move the fan lever to adjust the blower speed the from LO toHI. Motre the vent lever to direct airflow. 3-11