Defogging And Defrosting - GMC 2008 Savana Van Owner's Manual

If your vehicle has air conditioning, your heating/air
conditioning controls will look like this:
On hot days, open the windows to let hot inside air
escape; then close them. This helps to reduce the time
needed for the vehicle to cool down and the system
operates more efficiently.
#
(Air Conditioning): This setting will begin to cool
and dehumidify the air inside of the vehicle.
V
(Maximum Air Conditioning): Turn the right knob
V
to for maximum cooling. This setting cools the air the
fastest, by recirculating the inside air.

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 the
windshield and side windows.
3-20
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 in extremely cold conditions. 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. The temperature
knob should be in the red area and the fan control
toward high.
-
(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.
Do not drive the vehicle until all the windows are clear.