Outlet Adjustment; Passenger Compartment Air Filter - GMC T-Series 2007 Owner's Manual

Defogging and Defrosting
There are two modes to clear fog or frost from
your windshield. Press the defog button to
clear the windows of fog or moisture and warm
the passengers. Press the defrost button to
remove fog or frost from the windshield more
quickly.
/
(Defog): Press this button to direct the air
equally between the windshield and the floor
outlets. When you select this mode, the system
turns off recirculation and runs the air-conditioning
compressor unless the outside temperature is
at or below freezing. The recirculation mode
cannot be selected while in the defog mode.
0
(Defrost): Press this button to direct most of
the air to the windshield and the side window
outlets, with some air directed to the floor outlets.
In this mode, the system will automatically turn
off recirculation and run the air-conditioning
compressor, unless the outside temperature
is at or below freezing. Recirculation cannot
be selected while in the defrost mode.
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Outlet Adjustment

The air outlets are located in the center and on the
sides of your instrument panel. See Instrument
Panel Overview on page 100. You can move the
vents to direct the flow of air or close the outlets
altogether. When you close a vent, it will increase
the flow of air coming out of any vents that
are open.
Keep the path under the front seats clear of
objects to help circulate the air inside of your
vehicle more effectively.

Passenger Compartment Air Filter

The passenger compartment outside air is
routed through a passenger compartment filter.
The filter removes certain debris, including dirt
and leaves. Reductions in your climate control
system performance may indicate that the
filter needs to be inspected and cleaned.