1998 Pontiac Grand Am Owner's Manual - Page 136
1998 Pontiac Grand Am Manual
Page 136 highlights
Rear Window Defogger (If Equipped) The rear window defogger uses a warming grid to remove fog from the rear window. Press the defogger switch. The indicator light will glow. Do not attach a temporary vehicle license across the defogger gridon the rear window. NOTICE: Don't use a razor blade anything else sharp or on the insideof the rear window. you do, you If could cut or damage the warming grid, and the repairs wouldn't be covered by warranty. your If'your vehicleis traveling under45 mph (70 km/h), the rear window defoggerwill turn off automatically after about 10 minutes of use. If your vehicleis traveling over 45 mph (70 km/h), the defogger will operate continuously. You can turn the defogger off by turning off the ignition or pressing the switch again. 3-5