Opel Blazer Operation & Maintenance Instructions Manual page 25

Rear Window Defogger (Option)
Press ON to remove fog from the rear window. An
indicator light will glow. The defogger will turn off
automatically after a few minutes. You can also turn the
defogger off by pressing OFF or by turning the ignition
switch to OFF.
NOTICE:
Don't use a razor blade or something else sharp
on the inside the rear window. If you do, you
could cut or damage the warming grid.
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