1997 Buick Regal Owner's Manual - Page 167

Ventilation Tips 0 Rear Window Defogger Keep the hood and front air inlet freeof ice, snow or any other obstruction, such as leaves. The heater and defroster will work far better, reducing the chance of fogging the insideof your windows. When you enter a vehicle in cold weather, adjust the mode knob or button to FLOOR and the fan tothe highest speed for a few seconds before driving off. This helps clearthe intake ducts of snow and moisture and reduces the chance of fogging the inside of your windows. Keep the air path under the front seats clear of objects. This helps air to circulate throughout your vehicle. J C I 0 I REAR I I - 1 The rear window defogger uses a warming grid to remove fog fromthe rear window. Press the button to turn the rear defogger on. It will turn itself off after about 10 minutes. If you turn it on again, the rear defogger will only run for about five minutes before turning off. You can also turn it off by pressing the button again.