Climate Controls
Climate Control System
(With Air Conditioning)
With this system the heating, cooling, and ventilation
can be controlled.
A. Fan Control
B. Temperature
Control
C. Air Delivery
Mode ControlD. Air Conditioning
E. Outside Air
F. Recirculation
G. Rear Window
DefoggerTemperature Control:Turn clockwise or
counterclockwise to increase or decrease the
temperature inside the vehicle.
9(Fan Control):Turn clockwise or counterclockwise
to increase or decrease the fan speed. Turn the
knob all the way counterclockwise to turn the front
system off.
Air Delivery Mode Control:Turn clockwise or
counterclockwise to change the direction of the air ow
inside the vehicle. The knob can be positioned between
two modes to select a combination of those modes.
Select from the following:
H(Vent):Air is directed to the instrument panel
outlets.
)(Bi-Level):Air is divided between the instrument
panel and oor outlets.
6(Floor):Air is directed to the oor outlets, with
some air directed to the windshield and side window
outlets. In this mode, the system automatically
selects outside air. Recirculation cannot be selected
in oor mode.
3-24
Temperature Control:Turn clockwise or
counterclockwise to increase or decrease the
temperature inside the vehicle.
9(Fan Control):Turn clockwise or counterclockwise
to increase or decrease the fan speed. Turn the
knob all the way counterclockwise to turn the front
system off.
Air Delivery Mode Control:Turn clockwise or
counterclockwise to increase or decrease the
temperature inside the vehicle. The knob can be
positioned between two modes to select a combination
of those modes.
Select from the following:
H(Vent):Air is directed to the instrument panel
outlets.
)(Bi-Level):Air is divided between the instrument
panel and oor outlets.
6(Floor):Air is directed to the oor outlets, with
some air directed to the windshield, side window, and
second row oor outlets. In this mode, the system
automatically selects outside air.
-(Defog):This mode clears the windows of fog or
moisture. Air is directed to the windshield, oor outlets,
and side window vents.
0(Defrost):This mode removes fog or frost from
the windshield more quickly. Air is directed to the
windshield and the side window vents, with some air
directed to the oor vents. The system automatically
forces outside air into the vehicle.
Do not drive the vehicle until all the windows are clear.
3-27
Press the + or−buttons to increase or decrease the
cabin temperature. The driver side or passenger
side temperature display shows the temperature setting
decreasing or increasing.
The passenger’s temperature setting can be set to
match the driver’s temperature setting by pressing the
PASS button and turning off the PASS indicator.
When the passenger’s temperature setting is set
different than the driver’s setting, the indicator on the
PASS button illuminates and both the driver side
and passenger side temperature displays are shown.
Automatic Operation
AUTO (Automatic):When automatic operation is
active the system controls the inside temperature,
the air delivery, and the fan speed.
Use the steps below to place the entire system in
automatic mode:
1. Press the AUTO button.
When AUTO is selected, the display changes to
show the current temperature(s) and AUTO is lit on
the display. The current air delivery mode and
fan speed are also displayed for about 5 seconds.
When AUTO is selected, the air conditioning
operation and air inlet are automatically controlled.
The air conditioning compressor may run when
the outside temperature is above freezing. The air
inlet will normally be set to outside air. If it ishot outside, the air inlet may automatically switch to
the recirculate mode to help quickly cool down
the air inside the vehicle. The light on the button
comes on in recirculation.
2. Set the driver’s and passenger’s temperature.
To nd your comfort setting, start with a 74°F (23°C)
temperature setting and allow about 20 minutes
for the system to regulate. Use the driver or
passenger temperature buttons to adjust the
temperature setting as necessary. If a temperature
setting of 60°F (15°C) is chosen, the system
remains at the maximum cooling setting. If a
temperature setting of 90°F (32°C) is chosen, the
system remains at the maximum heat setting.
Choosing either maximum setting will not cause the
vehicle to heat or cool any faster.
Do not cover the solar sensor located on the top of the
instrument panel near the windshield. This sensor
regulates air temperature based on sun load. For more
information on the solar sensor, see “Sensors” later
in this section.
To avoid blowing cold air in cold weather, the system
delays turning the fan on until warm air is available.
The length of delay depends on the engine coolant
temperature. Pressing the fan switch overrides this delay
and changes the fan to a selected speed.
3-29
Manual Operation
DC(Fan Control):Press these buttons to increase or
decrease the fan speed.
Pressing either fan button while in automatic control
places the fan under manual control. The fan setting
remains displayed and the AUTO light turns off.
The air delivery mode remains under automatic control.
HG(Air Delivery Mode Control):Press these
buttons to change the direction of the air ow in the
vehicle. Repeatedly press either button until the desired
mode appears on the display. Pressing either mode
button while the system is off changes the air delivery
mode without turning the system on. Pressing either
mode button while in automatic control places the mode
under manual control.
The air delivery mode setting is displayed and the
AUTO light turns off. The fan remains under automatic
control.
H(Vent):Air is directed to the instrument panel outlets.
)(Bi-Level):Air is divided between the instrument
panel and oor outlets. Some air is directed towards the
windshield and side window outlets.
6(Floor):Air is directed to the oor outlets, with
some to the windshield, side window outlets, and
second row oor outlets. In this mode, the system
automatically selects outside air.
-(Defog):This mode clears the windows of fog or
moisture. Air is directed to the windshield, oor outlets,
and side window vents. In 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
defrost mode.
0(Defrost):This mode removes fog or frost from the
windshield more quickly. Air is directed to the windshield
and side window vents, with some directed to the oor
vents. In this mode, the system automatically forces
outside air into the vehicle and runs the air conditioning
compressor unless the outside temperature is close to
freezing. The recirculation mode cannot be selected while
in the defrost mode.
Do not drive the vehicle until all the windows are clear.
#(Air Conditioning):Press to turn the air conditioning
(A/C) compressor on and off. An indicator light comes on
to show that the air conditioning is on.
3-30
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
<(Rear Window Defogger):For vehicles with
this feature, press to turn the defogger on or off.
It automatically turns off several minutes after it has
been activated. The defogger can also be turned off by
turning the engine off. Do not drive the vehicle until
all the windows are clear.
Notice:Do not use a razor blade or sharp object
to clear the inside rear window. Do not adhere
anything to the defogger grid lines in the rear glass.
These actions may damage the rear defogger.
Repairs would not be covered by your warranty.
Heated Mirrors:For vehicles with heated outside
rearview mirrors, the mirrors heat to help clear fog or
frost from the surface of the mirror when the rear window
defog button is pressed. SeeOutside Power Mirrors
on page 2-59.
Sensors
The solar sensor, located
in the defrost grille, in the
middle of the instrument
panel, monitors the
solar heat. Do not cover
the solar sensor or
the system will not work
properly.
The interior temperature
sensor, located in the
headliner, measures the
temperature of the air
inside the 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.
3-32
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.
Outlet Adjustment
Use the air outlets located in the center and on the side
of the instrument panel to direct the air ow. Use the
thumbwheels near the air outlets to open or close off
the air ow.
Operation Tips
Clear away any ice, snow, or leaves from air inlets
at the base of the windshield that could block the
ow of air into the vehicle.
Keep the path under the front seats clear of objects
to help circulate the air inside of the vehicle more
effectively.
Use of non-GM approved hood de ectors can
adversely affect the performance of the system.
Check with your dealer/retailer before adding
equipment to the outside of the vehicle.
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 brie y 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.
3-33
Instrument Panel Cluster
The instrument cluster is designed to show how the vehicle is running. It shows how fast the vehicle is going, about
how much fuel the vehicle has and many other things needed to drive safely and economically. For vehicles with
a DURAMAX
®Diesel engine, see the DURAMAX®Diesel manual for more information. United States Light Duty Premium version shown. Canada, Uplevel, Base, Heavy Duty Clusters similar.
3-34
Speedometer and Odometer
The speedometer shows the vehicle speed in both
miles per hour (mph) and kilometers per hour (km/h).
The odometer shows how far the vehicle has been
driven, in either miles (used in the United States)
or kilometers (used in Canada).
Engine Hour Meter Display
The Driver Information Center (DIC) can also display
the number of hours the engine has run. To display the
engine hours, turn the ignition off, press and hold the
reset button for at least four seconds. The hour meter
displays for up to 30 seconds, or until the ignition is
turned on. SeeDIC Operation and Displays (With DIC
Buttons) on page 3-53orDIC Operation and Displays
(Without DIC Buttons) on page 3-59for more
information.
Trip Odometer
The trip odometer shows how far the vehicle has been
driven since the trip odometer was last set to zero.
Press the reset button, located on the instrument panel
cluster next to the voltmeter, to toggle between the
trip odometer and the regular odometer. Holding the
reset button for approximately one second while the
trip odometer is displayed will reset it.
To display the odometer reading with the ignition off,
press the reset button.
SeeDIC Operation and Displays (With DIC Buttons) on
page 3-53orDIC Operation and Displays (Without
DIC Buttons) on page 3-59for more information.
Tachometer
The tachometer displays the engine speed in revolutions
per minute (rpm). For a description of how Grade Braking
affects vehicle speed while the Tow/Haul Mode is
activated, see “Grade Braking (Allison Transmission
®)”
underTow/Haul Mode on page 2-34for more information.
3-35