Oldsmobile 1999 Aurora - Manual (Page 149)

yellow blue
3-7
Defogging and Defrosting
On cool, humid days, use the defog setting to keep the
windows clear while also providing heat through the
lower outlets. Turn the AUTO
- PUSH knob clockwise to
DEF to quickly remove fog or ice from the windshield.
Rear Window Defogger
R. DEFOG: Press this
button to warm the defogger
grid on the rear window. An
indicator light below the
button will glow while the
rear window defogger
is operating.
At speeds above 30 mph (48 km/h), the rear defogger
will stay on until you press the R. DEFOG button again.
At speeds below 30 mph (48 km/h), the rear window
defogger will turn off automatically after about
10 minutes of use. If you press it again, the defogger
will operate for about five minutes only. You can also
turn the defogger off by turning off the ignition.
Do not attach a temporary vehicle license across the
defogger grid on the rear window.
When you operate the rear window defogger,
the outside rearview mirrors are also heated to help
remove ice and fog.