climate control HUMMER H2 2008 User Guide

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’s or
passenger’s temperature buttons to adjust the
temperature setting as necessary. If you choose the
temperature setting of 60°F (15°C), the system
will remain at the maximum cooling setting. If you
choose the temperature setting of 90°F (32°C),
the system will remain at the maximum heat setting.
Choosing either maximum setting will not cause
the vehicle to heat or cool any faster.
Be careful not to cover the solar sensor located on
the top of the instrument panel near the windshield.
This sensor regulates air temperature based on sun load
and also turns on your headlamps. For more information
on the solar sensor, see “Sensors” later in this section.To avoid blowing cold air in cold weather, the system
will delay turning on the fan until warm air is available.
The length of delay depends on the engine coolant
temperature. Pressing the fan switch will override this
delay and change the fan to a selected speed.
O(On/Off):Press this button to turn off the climate
control system. Outside air will still enter the vehicle,
and will be directed to the oor. This direction can
be changed by pressing the mode button. Recirculation
can be selected once you have selected vent or
bi-level mode. The temperature can also be adjusted
using either temperature button. If you adjust the
air delivery mode or temperature settings with the
system off, the display will illuminate briey to show
you the settings and then return off. Press the on/off
button or the up down arrows on the fan switch,
the defrost button, AUTO button, or the air conditioning
button to turn the system on when it is off.
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The recirculation mode cannot be used with oor,
defrost, or defogging modes. If you try to select
recirculation in one of those modes, the indicator will
ash three times and turn off. The air conditioning
compressor will also come on when this mode is
activated. While in recirculation mode the windows
may fog when the weather is cold and damp.
To clear the fog, select either the defog or defrost
mode and increase the fan speed. Recirculation
mode can be turned off by pressing the button again,
or turning off the engine.
AUX:For vehicles with the rear heat and air
conditioning controls. Press the AUX button to turn
the rear climate control system on or off. SeeRear
Air Conditioning and Heating System and Electronic
Climate Controls on page 3-29.
;(Outside Air, If Equipped):Press this button
to turn on the outside air mode. When this mode
is selected, air from outside the vehicle circulates
throughout the vehicle. An indicator light on the button
comes on to show that it is activated. The outside
air mode can be used with all modes, but it cannot
be used with the recirculation mode.
Air Conditioning
#
(Air Conditioning):Press this button to turn the
air conditioning (A/C) compressor on and off. When air
conditioning is selected, an indicator light comes on
to show that the air conditioning has been activated.
Pressing this button when the outside temperature is
too cool for air conditioning will make the air conditioning
indicator ash three times and then turn off to let you
know the air conditioning mode is not available. If the
air conditioning is on and the outside temperature
drops below a temperature which is too cool for
air conditioning to be effective, the air conditioning
light turns off to show that the air conditioning mode
has been canceled.
On hot days, open the windows long enough to let
hot inside air escape. This helps to reduce the time
it takes for your vehicle to cool down. It also helps the
system to operate more efficiently.
The air conditioning system removes moisture from the
air, so a small amount of water might drip underneath
the vehicle while idling or after turning off the engine.
This is normal.
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Sensors
The solar sensor,
located in the defrost
grille in the middle of
the instrument panel,
monitors the solar
radiation. Do not cover
the solar sensor or
the system will not
work properly.
The interior temperature
sensor located in the
headliner above the
driver side seat 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.
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.
3-27

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 the 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, oor outlets,
and side window vents. When this mode is selected,
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 oor vents. In this mode, the
system will automatically force outside air into the
vehicle. The recirculation mode cannot be selected while
in the defrost mode. The air conditioning compressor
runs automatically in this setting, unless the outside
temperature is close to freezing. Do not drive the
vehicle until all the windows are clear.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
<(Rear Window Defogger):Press this button to
turn on the rear window defogger. It will automatically
turn off several minutes after it has been activated.
The defogger can also be turned off by pressing
the button again or by turning off the engine. Do not
drive the vehicle until all the windows are clear.
If your vehicle has heated outside rearview mirrors,
the mirrors will heat to help clear fog or frost from the
surface of the mirror when the rear window defog
button is pressed.
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.
3-28

Outlet Adjustment
Your vehicle has air outlets that let you adjust the
direction and amount of airow inside the vehicle.
Use the thumbwheels located beside the air outlets to
direct the airow up and down. Use the thumbwheels
below the air outlets to direct the air left or right.
Operation Tips

Keep the hood and front air inlets free of ice,
snow, or any other obstruction, such as leaves.
The heater and defroster will work far better,
reducing the chance of fogging the inside of
the windows.
Keep the air path under the front seats clear of
objects. This helps air to circulate throughout
the vehicle.
Adding outside equipment to the front of the
vehicle, such as hood-air deectors, etc., may affect
the performance of the heating and air conditioning
system. Check with your dealer/retailer before
adding equipment to the outside of your vehicle.
Rear Air Conditioning and
Heating System and Electronic
Climate Controls
If your vehicle has this rear climate control system
there are rear seat audio controls located in the
center console.
The rear system can be controlled through the AUX
button on the front climate control panel. Press the
AUX button to turn the rear climate control system
on or off. An indicator light in the AUX button comes
on when the rear climate control system is on. The
direction, temperature, and speed of the airow for
the rear of the vehicle will be the same as those set
for the front of the vehicle.
Use the controls located in the rear of the front console,
to independently control the air ow for the rear of
the vehicle separately from that of the front of the
vehicle. To turn the system on, press any of the rear
air conditioning control buttons, except the
Cbutton.
To turn the system off, press and hold the
Cbutton.
3-29

Manual Operation
DC(Fan):The fan buttons on the rear seat audio
control panel let you manually adjust the fan speed.
Press
Dto increase airow andCto decrease airow.+/−(Increase/Decrease Temperature):These buttons
select the temperature of the air owing into the rear
passenger area. Press the + button for warmer air
and press the−button for cooler air. The temperature
settings will display in 0-12 increments, going from
the coolest (0) to the warmest (12) setting.
N(Mode):Press the mode button to manually change
the direction of the airow in the vehicle. Repeatedly
press the button until the desired mode appears on
the display. Multiple presses cycles through the
delivery selections.
H(Vent):This mode directs air through the
headliner outlets.
)(Bi-Level):This mode directs air through the
oor outlets as well as the headliner outlets. The rear
system oor outlet is located at the passenger side
rear quarter trim panel.
6(Floor):This mode directs air through the oor
outlets. The rear system oor outlets are located
under the seats. Rear Climate Control with Rear Seat
Audio Controls
3-30

P(Power):Press thePbutton to turn RSA on
and off.
Volume:Turn this knob to increase or to decrease
the volume of the wired headphones. The left knob
controls the left headphones and the right knob controls
the right headphones.
SRCE (Source):Press this button to switch between
the radio (AM/FM), XM™ (if equipped), CD, and if
your vehicle has these features, DVD, front auxiliary,
and rear auxiliary.
©¨(Seek):When listening to FM, AM, or XM™
(if equipped), press the left
©or right¨seek arrow
to go to the next or the previous station or channels and
stay there. This function is inactive, with some radios,
if the front seat passengers are listening to the radio.
Press and hold either the left
©or right¨seek
arrow until the display ashes, to tune to an individual
station. The display stops ashing after the buttons
have not been pushed for more than two seconds.
This function is inactive, with some radios, if the front
seat passengers are listening to the radio.
While listening to a disc, press the
©seek arrow
to go back to the start of the current track or chapter
(if more than ten seconds have played). Press the
right
¨seek arrow to go to the next track or chapter
on the disc. This function is inactive, with some radios,
if the front seat passengers are listening to the radio.
When a DVD video menu is being displayed, press
either the left
©or right¨seek arrow to perform
a cursor up or down on the menu. Hold either the
left
©or right¨seek arrow to perform a cursor
left or right on the menu. Rear Seat Audio with Rear Climate Control shown
3-115

The StabiliTrak®light will
ash on the instrument
panel cluster when
the system is both on
and activated.
You may also feel or hear the system working; this is
normal.
The traction control disable
button is located on the
instrument panel below the
climate controls.
The traction control part of StabiliTrak
®can be turned
off by pressing and releasing the StabiliTrak®button
if both systems (traction control and StabiliTrak®) were
previously on. To disable both traction control and
StabiliTrak
®, press and hold the button for ve seconds.
Traction control and StabiliTrak
®can be turned on
by pressing and releasing the StabiliTrak®button if
not automatically shut off for any other reason.When the TCS or StabiliTrak
®system is turned off,
the StabiliTrak®light and the appropriate TCS off
or StabiliTrak®off message will be displayed on the
DIC to warn the driver. Your vehicle will still have
brake-traction control when traction control is off, but
will not be able to use the engine speed management
system. See “Traction Control Operation” next for
more information.
When the traction control system has been turned off,
you may still hear system noises as a result of the
brake-traction control coming on.
It is recommended to leave the system on for normal
driving conditions, but it may be necessary to turn
the system off if your vehicle is stuck in sand, mud,
ice or snow, and you want to “rock” your vehicle
to attempt to free it. It may also be necessary to turn
off the system when driving in extreme off-road
conditions where high wheel spin is required. SeeIf
Your Vehicle is Stuck in Sand, Mud, Ice, or Snow
on page 4-39.
When the transfer case is in Four-Wheel-Low Lock,
the stability system is automatically disabled, the
StabiliTrak
®light will come on and the STABILITRAK
OFF message will appear on the DIC. Both traction
control and StabiliTrak
®are automatically disabled in
this condition.
4-8

Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specied
government test course. For example, a tire
graded 150 would wear one and a half (1.5) times
as well on the government course as a tire
graded 100. The relative performance of tires
depends upon the actual conditions of their use,
however, and may depart signicantly from
the norm due to variations in driving habits, service
practices, and differences in road characteristics
and climate.
Traction – AA, A, B, C
The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the
tire’s ability to stop on wet pavement as
measured under controlled conditions on specied
government test surfaces of asphalt and concrete.
A tire marked C may have poor traction
performance.
Warning
:The traction grade assigned to this
tire is based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.
Temperature – A, B, C
The temperature grades are A (the highest), B,
and C, representing the tire’s resistance to
the generation of heat and its ability to dissipate
heat when tested under controlled conditions on a
specied indoor laboratory test wheel. Sustained
high temperature can cause the material of the tire
to degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance
which all passenger car tires must meet under
the Federal Motor Vehicle Safety Standard
No. 109. Grades B and A represent higher levels
of performance on the laboratory test wheel
than the minimum required by law.
Warning
:The temperature grade for this tire
is established for a tire that is properly inated
and not overloaded. Excessive speed,
underination, or excessive loading, either
separately or in combination, can cause heat
buildup and possible tire failure.
5-73

Instrument Panel Fuse Block
The instrument panel fuse block access door is located
on the driver side edge of the instrument panel.
Fuses Usage
LT DRDriver Side Power Window Circuit
Breaker
REAR SEAT Rear Seats
AUX PWR2 Floor Console Power Outlets
SWC BKLT Steering Wheel Controls Backlight
DDM Driver Door Module
CTSYDome Lamps, Front Passenger Side
Turn Signal
LT STOP TRN Driver Side Turn Signal, Stoplamp
DIM Instrument Panel Back Lighting
RT STOP TRN Passenger Side Turn Signal
PDM Passenger Door Module
UNLCK2 Power Door Lock 2 (Unlock Feature)
LCK2 Power Door Lock 2 (Lock Feature)
STOP LAMPSStoplamps, Center-High Mounted
Stoplamp
REAR HVAC Rear Climate Controls
BCM Body Control Module
5-111