GMC 2007 Envoy Denali Owner's Manual page 188

Driver's Side Temperature Lever: The lever on
the left side of the climate control panel is
used to raise or lower the temperature on the
driver's side of the vehicle. Slide the lever up or
down to adjust the temperature.
Passenger's Side Temperature Lever: The lever
on the right side of the climate control panel is
used to raise or lower the temperature on
the passenger's side of the vehicle. Slide the lever
up or down to adjust the temperature. This lever
also adjusts the temperature to the rear seat
outlets.
When the temperature outside is 0°F (-18°C) or
lower, use the engine coolant heater, if the vehicle
has one, to provide warmer air, faster to your
vehicle.
#
(Air Conditioning): Press this button to turn
the air-conditioning system on or off. When
the button is pressed, an indicator light will come
on and the system will begin to cool and
dehumidify the air inside of the vehicle. You may
notice a slight change in engine performance
when the air conditioning compressor shuts off and
turns on again. This is normal.
188
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 choose from to clear fog or frost
from your windshield. 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.
Turn the right knob clockwise or counterclockwise
to select one of the following modes:
-
(Defog): This mode directs the air to the floor
outlets, windshield and side window outlets.
The recirculation button cannot be selected while
in defog mode.
1
(Defrost): This mode directs most of the air to
the windshield and the side window outlets, with
only a little air directed to the floor outlets. The air
conditioning compressor may run to dehumidify
the air to prevent window fogging. The recirculation
button cannot be selected while in defrost mode.
Do not drive the vehicle until all the windows
are clear.