GMC 2007 Savana - Manual (Page 161)

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 is used properly. There are two modes to
clear fog or frost from your 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 knob on the right of the climate control
panel to select the defog or defrost mode.
- (Defog): With this setting, the outside air
comes out of both the floor and defroster outlets.
Adjust the temperature knob for warmer or
cooler air. The air conditioning compressor may
operate in this setting to dehumidify the air.
1
(Defrost): This setting operates the defroster.
Most of the air comes out near the windshield,
with some going to the floor outlets and front side
windows. The air conditioning compressor may
operate in this setting to dehumidify the air.
The defog setting is useful for cold weather with
a large number of passengers or very humid
conditions to help keep the windshield clear.
Use defrost to remove fog or ice from the
windshield quickly in extremely cold conditions.
The temperature knob should be in the red area
and the fan control toward high. Do not drive the
vehicle until all the windows are clear.
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