Pontiac 1998 Grand Am Owner's Manual page 136

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.
If' your vehicle is traveling under 45 mph (70
km/h),
the
rear window defogger
will
turn off automatically after
about 10 minutes of use. If your vehicle is 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.
Do
not attach a temporary vehicle license across
the
defogger grid
on
the
rear
window.
NOTICE:
Don't use a razor blade or anything else sharp on
the inside of the rear window. If you do, you
could cut or damage the warming grid, and the
repairs wouldn't be covered by your warranty.
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