1997 Buick Century Owner's Manual - Page 155

Ventilation Tips 0 Rear Window Defogger Keep the hood and front air inlet free of ice, snow or any other obstruction,such as leaves. The heaterand defroster will work far better, reducing the chance of of fogging the inside your windows. When you enter a vehicle in cold weather, adjust the mode knob or button to FLOOR and the fan to the highest speed for a few seconds before driving off. This helps clearthe intake ductsof snow and moisture and reduces thechance of fogging the inside of your windows. C D REAR 0 0 Keep the air path under the front seats clear of objects. This helps air circulate throughout to your vehicle. The rear window defogger uses a warming grid to remove fog from the rear window. Press the button to turn the rear defogger on. It will turn itself off after about 10 minutes. 3-11