Pontiac 1993 Grand Am Owner's Manual page 106

I
Defogging Windows with
Air Conditioning System
To defog the windshield, turn all three
control knobs to the far right.
To defog the side windows, turn the
right control knob to
1 2
(Bi-Level)
and the fan control knob to
HIGH.
Aim
the side vents toward the side windows.
For increased air flow to the side vents,
close the center vents.
Rear Window Defogger
(OPTION)
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 kmlh), 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.
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