1998 Buick Skylark Owner's Manual - Page 131

If you turn on the rear defogger while driving at or above 45 mph (70 km/h), it will stay on as long that speed as is maintained. You must press the button to shutit off. If you drive below45 mph (70 km/h) for morethan 10 minutes, the rear defogger will automatically shut off. NOTICE: Scraping the inside your rear window could of cut and damage the heater. Your warranty would not cover this damage. Don't put decals there; you might have to scrape them off. Ventilation System Your vehicle's flow-through ventilation system supplies i it outside a r into the vehicle when is moving. Outside air will also enter the vehicle when the is running. fan Air Outlets Adjust the direction of airflow by moving the louvered knob. vents with the center control 3-4