2001 Cadillac DeVille Owner's Manual - Page 198

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. Ventilation Tips D Keep the hood and front air inlet free of ice, snow or any other obstruction (such as leaves). The heater and defroster will work far better, reducing the chance of fogging the inside of the windows. objects. This helps circulate air throughout your vehicle. D Keep the air path under the front seats clear of Passenger Compartment Air Filter This ventilation system includes a charcoal air filter that helps to remove dust, pollen, etc. from the air flowing into your vehicle. A restriction in the airflow coming into the passenger compartment could be the result of dirt in the filter. For more information, see "Passenger Compartment Air Filter Replacement" in the Index. Also see the Maintenance Schedule booklet for when to change the filter. 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 thumbwheels located on each side of the outlets downward. 3-9