GMC 2003 Yukon Denali User Manual page 165

2
(Panel): This setting will deliver air to the
instrument panel outlets.
+2
(Bi-Level): This setting will deliver warmer air to the
floor and cooler air to the instrument panel outlets.
(Floor): This setting will deliver air to the floor
outlets.
+3
(Defog): See "Defogging and Defrosting" later in
this section.
(Recirculation): Press this button to limit the
amount of outside air entering your vehicle. The light on
the recirculation button will glow. This is helpful when
you are trying to limit odors entering your vehicle and for
maximum air conditioning performance in hot weather.
Press this button again to allow outside air to enter
the vehicle. The light on the recirculation button
will go off.
Pressing this button cancels the auto recirculation
feature. To resume the auto recirculation function, press
the AUTO button. Each time the vehicle is started,
the system will revert to the auto recirculation function.
If you select recirculation while in defrost, defog or
floor, the light on the button will flash and go out to let
you know this is not allowed. This is to prevent fogging.
When the weather is cool or damp, operating the
system in recirculation for extended periods of time may
cause fogging of the vehicle's windows. To clear the
fog, select either defog or front defrost. Be sure
A/C
off
is not selected. You will want to allow the air
conditioning to run automatically to help dehumidify
the air.
Display
If you press the MODE button to select an air delivery
mode, the display will change to show you the selected
air delivery mode. After ten seconds, the display will
change to show the driver temperature setting and the
selected mode.
If you press the up or down arrows on the fan switch,
the display will change to show the selected fan speed.
After ten seconds, the display will change to show
the driver temperature setting and the selected mode.
Whenever you press AUTO, the display will change
to show the following:
the current driver's set temperature and an arrow
for five seconds,
the current passenger's set temperature setting and
an arrow for five seconds and
0
the automatic air delivery mode and fan speed.
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