Automatic Operation
AUTO9(Automatic Fan):When this position is
selected on the fan control, the system will adjust the fan
speed. If the OnStar
®system is activated when this
position is selected, the climate control fan speed
will lower.
AUTO (Automatic Mode):
1. Turn the fan control to the AUTO position.
2. Turn the mode control to the AUTO position.
3. Adjust the temperature to a comfortable setting
between 68°F (21°C) and 78°F (26°C).
Choosing the coldest or warmest temperature
setting will not cause the system to heat or cool any
faster. In cold weather, the system will start at
reduced fan speeds to avoid blowing cold air into
your vehicle until warmer air is available. The
system will start out blowing air at the oor but may
change modes automatically as the vehicle
warms up to maintain the chosen temperature
setting. The length of time needed to warm
the interior will depend on the outside temperature
and temperature of the vehicle.
4. Wait 20 to 30 minutes for the system to stabilize in
order for the system to regulate automatically. Then
adjust the temperature as necessary to nd your
comfort setting.Do not cover the solar sensor located in the center of
the instrument panel near the windshield. For more
information on the solar sensor, see “Sensors” later in
this section.
After your vehicle is started, the display will show the
interior temperature settings and the outside
temperature.
If the AUTO position is selected on the fan or mode
control, the system will automatically control the
air conditioning compressor. The A/C compressor will
run automatically even at cool outside temperatures
in order to dehumidify the air. The A/C indicator light
will be lit when the system is operating automatically,
even at near freezing outside temperatures. Press
the A/C button on the fan control to turn off the A/C.
For improved window clearing performance in defog
or defrost modes, the A/C compressor will run
automatically in damp cool conditions.
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Sensors
The solar sensor, located in the defrost grille, middle of
the instrument panel, monitors the solar radiation.
Do not cover the solar sensor or the system will not
work properly.There is also an interior temperature sensor located
next to the steering wheel that measures the
temperature of the air inside your vehicle.
There is also an exterior temperature sensor located
behind the front grille. This sensor reads the outside air
temperature and helps maintain the temperature inside
the vehicle. Any cover on the front of the vehicle could
cause a false reading in the displayed temperature.
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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 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 from
your windshield. Use the oor/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.
W(Floor/Defog):Turning the control to this mode
directs approximately half of the air to the oor outlets
and the remaining air is directed to the side window
outlets and to the windshield. 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 oor/defog mode.
0(Defrost):Turning the control to this mode directs
most of the air to the windshield and the side window
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. Do not drive the vehicle until all the windows
are clear.
For professional vehicles, air will be allowed to ow
through the rear outlets. For quicker defrost, press the
AUX button on the front climate control system so
that the light is not lit.
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Automatic Operation
«A ª(Fan):Press this button until AUTO appears
on the display to place the system in automatic mode.
When automatic operation is active, the system will
automatically control the fan speed. If in auto fan mode,
pressing the up arrow button will cancel automatic
operation and places the system in manual mode. If in
auto mode, pressing the down arrow will turn the
rear climate control system off.
«Nª(Mode):Press the this button until AUTO
appears on the display to place the system in automatic
mode. When automatic operation is active, the system
will automatically control the air delivery mode.
Manual Operation
«A ª(Fan):Press these up or down arrow
buttons to increase or decrease the fan speed.
«bª(Temperature):Press these up or down
arrow buttons to increase or decrease the temperature
for the rear seat passengers. Once the rear setting
temperature is altered from following the front setting
temperature, it will no longer follow changes to the front
setting temperature until the front climate control
AUX button resets it.
«Nª(Mode):Press these buttons to change the
air delivery mode. If in AUTO air delivery mode, pressing
the up arrow button will cancel automatic operation
and place the system in manual mode.
Y(Vent):This mode directs air to the upper outlets.
%(Bi-Level):This mode directs half the air to
the upper outlets, and the other half to the oor outlets.
[(Floor):This mode directs the air to the oor
outlets.
For more information on how to use the front climate
control system, seeDual Climate Control System
on page 3-44.
For more information on the air outlets, seeOutlet
Adjustment on page 3-50. Be sure to keep the area
under the front seats clear of any objects so that the air
inside of your vehicle can circulate effectively.
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Speedometer and Odometer
Your speedometer lets you see your speed in both
miles per hour (mph) and kilometers per hour (km/h).
See “MPH (km)” underDIC Controls and Displays
on page 3-72for more information.
The odometer mileage can be checked without
the vehicle running. Your vehicle’s odometer works
together with the driver information center. You can set
a Trip A and a Trip B odometer. See “Trip Information”
underDIC Controls and Displays on page 3-72for
more information.
If your vehicle ever needs a new odometer installed, the
new one will be set to the correct mileage total of the
old odometer.
Tachometer
This gage indicates
the engine speed in
revolutions per
minute (rpm).
Safety Belt Reminder Light
When the key is turned to RUN or START, a chime will
sound for several seconds to remind you and your
passengers to buckle your safety belts. The driver safety
belt light will also come on and stay on for several
seconds, then it will ash for several more. You should
buckle your seat belt.
This chime and light will
be repeated if the driver
remains unbuckled and
the vehicle is in motion.
If the driver’s belt is buckled, neither the chime nor the
light will come on.
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