Chevrolet 2007 Cobalt Owner's Manual page 156

Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate
control system is used properly. There are
two modes to clear fog or frost from the windshield
and side windows. Use the defog mode to clear
the windows of fog or moisture and warm the
passengers. Use the defrost mode to remove fog
or frost from the windshield more quickly. For
best results, clear all snow and ice from the
windshield before defrosting.
Turn the left knob to select the defog or
defrost mode.
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(Defog): This mode directs about half of the
air to the windshield and the side window
outlets and half to the floor outlets. When you
select this mode the system runs the air
conditioning compressor. To defog the windows
faster, turn the temperature control knob clockwise
to the warmest setting.
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(Defrost): This mode directs most of the air to
the windshield, with some air directed to the
side window outlets and the floor outlets. When
you select this mode the system runs the air
conditioning compressor. To defrost the windows
faster, turn the temperature control knob
clockwise to the warmest setting.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
The rear window defogger will only work when the
ignition is in RUN.
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(Rear): Press the button to turn the rear
window defogger on or off. Be sure to clear as
much snow from the rear window as possible.
An indicator light above the button will come on to
let you know that the rear window defogger is
activated.