Warning Lights, Gages, And Indicators - GMC 2009 Yukon XL Owner's Manual

Automatic Operation, If Equipped.
AUTO: Press the air delivery mode button until this
setting is selected to control the inside temperature, air
delivery, and fan speed. AUTO appears in the display
when automatic operation is active.
+/− (Increase/Decrease Temperature): Press the
+ or − buttons to increase or decrease the cabin
temperature. The rear control temperature display will
show the temperature setting increasing or decreasing.
The display only indicates climate control functions when
the system is in rear independent mode.
Manual Operation
D C
(Fan Control): Press these buttons on the rear
seat audio control panel to increase or decrease the
airflow. Pressing the fan up button when the system is
off will turn the system on. The air delivery mode will
remain under automatic control.
+/− (Temperature Control): Press these buttons to
adjust the temperature of the air flowing into the
passenger area. Press the + button for warmer air and
press the − button for cooler air.
N
(Air Delivery Mode Control): Press the mode
button to change the direction of the airflow in the
vehicle. Repeatedly press the button until the desired
mode appears on the display. Multiple presses will cycle
through the delivery selections.
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Warning Lights, Gages, and
Indicators
Warning lights and gages can signal that something is
wrong before it becomes serious enough to cause
an expensive repair or replacement. Paying attention to
the warning lights and gages could prevent injury.
Warning lights come on when there may be or is a
problem with one of the vehicle's functions. Some
warning lights come on briefly when the engine is started
to indicate they are working.
Gages can indicate when there may be or is a problem
with one of the vehicle's functions. Often gages and
warning lights work together to indicate a problem with
the vehicle.
When one of the warning lights comes on and stays on
while driving, or when one of the gages shows there
may be a problem, check the section that explains
what to do. Follow this manual's advice. Waiting to do
repairs can be costly and even dangerous.