Chevrolet 2007 Avalanche Owner's Manual page 237

In order to prevent false temperature readings
at startup, the displayed temperature will not
change until the following occurs:
•
Vehicle speed is above 10 mph (16 kmh)
for 5 minutes.
•
Vehicle speed is above 32 mph (51 kmh)
for 2 and a half minutes.
The climate control system uses the information
from these sensors to maintain your comfort
setting by adjusting the outlet temperature, fan
speed, and the air delivery mode. The system
may also supply cooler air to the side of the
vehicle facing the sun. The recirculation mode
will also be used as needed to maintain cool
outlet temperatures.
Defogging and Defrosting
Fog on the inside of the 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 your
windshield.
Use the mode up and down arrows to select the
defog or defrost modes.
-
(Defog): The defog mode is used to clear
the windows of fog or moisture and warm
the passengers. This mode directs air to the
windshield, floor outlets, and side window vents.
When you select this mode, the system turns
off recirculation and runs the air conditioning
compressor unless the outside temperature is
close to freezing. The recirculation mode cannot
be selected while in the defog mode. Do not
drive the vehicle until all the windows are clear.
0
(Defrost): Press this button to remove fog
or frost from the windshield more quickly.
This mode directs a portion of the air to the
windshield and side window vents and some to
the floor vents. In this mode, the system will
automatically force outside air into your vehicle.
The recirculation mode cannot be selected
while in the defrost mode. The air conditioning
compressor will run automatically in this setting,
unless the outside temperature is close to
freezing. Do not drive the vehicle until all the
windows are clear.
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