j (Side Window Defog): Turn the thumbwheel to thissymbol to use the side window defog setting. The aircoming through the outlets will be directed towardthe side windows to clear fog.k (Open): Turn the thumbwheel to this symbol toopen the outlets completely and allow the maximumamount of air to enter your vehicle. A small amount of airwill still be directed to the side windows.l (Closed): Turn the thumbwheel to this symbol toclose the outlets and minimize the amount of air enteringthe vehicle.Operation Tips• Clear away any ice, snow or leaves from the airinlets at the base of the windshield that mayblock the flow of air into your vehicle.• Use of non-GM approved hood deflectors mayadversely affect the performance of the system.• Keep the path under the front seats clear of objectsto help circulate the air inside of your vehicle moreeffectively.• If the airflow seems low when the fan speed is atthe highest setting, the passenger compartmentair filter may need to be replaced. For moreinformation, seePassenger Compartment Air Filteron page 3-35.3-33