2007 HUMMER H2 air conditioning

Automatic Operation
AUTO (Automatic):When automatic operation is
active the system will control 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 will
change to show the current driver’s set
temperature, delivery mode and fan speed.
Press the AUTO button again within
ve seconds to display the passenger’s set
temperature.
If the driver and passenger’s temperature
settings are not the same, the opposite side
temperature setting will be displayed for
an additional ve seconds. To make the
passenger’s temperature the same as
the driver’s press and hold the AUTO button
for about four seconds.
When auto is selected, the air conditioning
operation and air inlet will be automatically
controlled. The air conditioning compressor will
run when the outside temperature is over about
40°F (4°C). The air inlet will normally be set to
outside air. If it’s hot outside, the air inlet mayautomatically switch to recirculate inside air to
help quickly cool down your vehicle. The light
on the button will illuminate 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. Turn the
driver’s or passenger’s side temperature knob
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 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.
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.
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9(Off):Press this button to turn off the entire
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. The temperature can also be
adjusted using either temperature knob. Press the
up or down arrows on the fan switch, the defrost
button, the AUTO button, or the air conditioning
button to turn the system on when it is off.
Manual Operation
You may manually adjust the air delivery mode or
fan speed.
w9x(Fan):The switch with the fan symbol
allows you to manually adjust the fan speed. Press
the up arrow to increase fan speed and the
down arrow to decrease fan speed.
Pressing this button when the system is off will
turn the system on.
C(Mode):Press this button to manually
change the direction of the airow in your vehicle;
repeatedly press the button until the desired
mode appears on the display.If you press the mode button to select an air
delivery mode, the display will change to show you
the selected air mode delivery. The display will then
show the current status of the system. When the
system is turned off, the display will go blank after
displaying the current status of the system.
H(Panel):This setting will deliver air to the
instrument panel outlets.
)(Bi-Level):This setting will deliver warmer air
to the oor and cooler air to the instrument
panel outlets.
6(Floor):This setting will deliver air to the
oor outlets.
-(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.
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Pressing this button also 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
oor, the light in the button will ash and then go out
to let you know that this is not allowed. This is
normal and helps 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.
You may also notice that the A/C compressor will
run while in recirculation mode. This is normal and
helps to prevent fogging.
9(Off):Press this button to turn off the entire
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. The temperature can also be adjusted using
either temperature knob. Press the up or down
arrows on the fan switch, the defrost button, the
AUTO button, or the air conditioning button to turn
the system on when it is off.
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 ve seconds,
the current passenger’s set temperature
setting and an arrow for ve seconds and
the automatic air delivery mode and fan speed.
If the driver’s and passenger’s temperature settings
are the same when AUTO is pressed, the
temperature setting and both arrows will be
displayed for ve seconds along with the automatic
air delivery mode and fan speed. After the
ve second update, the display will change to show
the temperature setting, both arrows and AUTO.
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Air Conditioning
#
(Air Conditioning):Press this button to turn
the air conditioning (A/C) compressor on and
off. The snowake symbol will appear on
the display when the A/C is on.
Pressing this button when the outside temperature
is too cool for air conditioning to be effective will
make the snowake symbol ash three times
and then turn off to let you know that 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 snowake
symbol will turn off to let you know that the air
conditioning mode has been canceled.
When air conditioning is selected or in AUTO
mode, the system will run the air conditioning
automatically to cool and dehumidify the air
entering the vehicle. If you select A/C off while in
front defrost, defog or recirculation, the A/C
snowake symbol will turn off, but the A/C
compressor will still run to help prevent fogging.On hot days, open the windows long enough to let
hot inside air escape. This reduces the time it takes
for your vehicle to cool down. Then keep your
windows closed for the air conditioner to work
its best.
On cool, but sunny days while using manual
operation of the automatic system, use bi-level to
deliver warm air to the oor and cooler air to
the instrument panel outlets. To warm or cool the
air delivered, turn the temperature knob to the
desired setting.
In AUTO mode the system will cool and dehumidify
the air inside the vehicle. Also while in AUTO
mode, the system will maximize its performance
by using recirculation as necessary.
Heating
On cold days when using manual operation of the
automatic system, choose oor mode to deliver
air to the oor outlets. To warm or cool the
air delivered, turn the temperature knob to the
desired setting.
If you want to use the automatic mode, press
AUTO and adjust the temperature by turning the
temperature knob.
The heater works best if you keep the windows
closed while using it.
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Defogging and Defrosting
You can use either defog or front defrost to clear
fog or frost from your windshield. Use the
defog mode to clear the windows of fog or
moisture. Use the front defrost button to defrost
the front windshield.
-(Defog):Use this setting to clear the windows
of fog or moisture. Press the mode button to
select this setting. This setting will deliver air to
the oor and windshield outlets.
0(Front Defrost):Press the front defrost button
to defrost the windshield. The system will
automatically control the fan speed if you select
defrost from AUTO mode. If the outside
temperature is 40°F (4°C) or warmer, your air
conditioning compressor will automatically run to
help dehumidify the air and dry the windshield.
Rear Window Defogger
If your vehicle has this feature, the lines you see
on the rear window warm the glass. The rear
window defogger uses a warming grid to remove
fog from the rear window.
<(Rear):Press this button to turn the rear
window defogger on or off. An indicator light in the
button will come on to let you know that the
rear window defogger is activated.
The rear window defogger will turn off about
10 minutes after the button is pressed. If you need
additional warming time, press the button again.
If your vehicle is equipped with heated mirrors this
button will activate them.
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.
Outlet Adjustment
Your vehicle has air outlets that allow you to
adjust the direction and amount of airow inside
the vehicle. Push the knob in the center of
the outlet up, down, left or right to move the outlet
in the direction you would like. Turn the knob in
the center of the outlet so the louvers open
or close to increase or decrease airow.
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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 your windows.
Keep the air path under the front seats clear
of objects. This helps air to circulate
throughout your vehicle.
Adding outside equipment to the front of your
vehicle, such as hood-air deectors, etc.,
may affect the performance of the heating and
air conditioning system. Check with your
dealer before adding equipment to the outside
of your vehicle.
Warning Lights, Gages, and
Indicators
This part describes the warning lights and gages
on your vehicle. The pictures will help you
locate them.
Warning lights and gages can signal that
something is wrong before it becomes serious
enough to cause an expensive repair orreplacement. Paying attention to your warning
lights and gages could also save you or others
from injury.
Warning lights come on when there may be or
is a problem with one of your vehicle’s functions.
As you will see in the details on the next few
pages, some warning lights come on briey when
you start the engine just to let you know they
are working. If you are familiar with this section,
you should not be alarmed when this happens.
Gages can indicate when there may be or is a
problem with one of your vehicle’s functions. Often
gages and warning lights work together to let you
know when there is a problem with your vehicle.
When one of the warning lights comes on and
stays on when you are driving, or when one of the
gages shows there may be a problem, check
the section that tells you what to do about
it. Please follow this manual’s advice. Waiting to
do repairs can be costly – and even dangerous. So
please get to know your warning lights and
gages. They are a big help.
Your vehicle also has a Driver Information
Center (DIC) that works along with warning lights
and gages. SeeDIC Warnings and Messages
on page 226.
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ENGINE COOLANT HOT
This message displays if the cooling system
temperature gets hot. Turn off the air conditioning.
If the message is still on, or if the engine coolant
temperature gage continues to rise, pull the vehicle
over when it is safe to do so. SeeEngine
Coolant Temperature Gage on page 213for more
information. Stop the vehicle and let the engine
idle in PARK (P) for a few minutes to allow
the coolant to reach a safe temperature. This
message clears when the coolant temperature
drops to a safe operating temperature. Press any
of the DIC buttons, or the trip stem, to
acknowledge this message and clear it from the
DIC display.
ENGINE OVERHEATED
This message displays and a chime sounds if the
engine cooling system reaches unsafe
temperatures for operation. Stop and turn off the
vehicle as soon as it is safe to do so to avoid
severe damage. This message clears when the
engine has cooled to a safe operating temperature.
FUEL LEVEL LOW
This message displays and a chime sounds if the
fuel level is low. Refuel as soon as possible.
Press any of the DIC buttons, or the trip stem, to
acknowledge this message and clear it from
the DIC display. This message also clears itself
after 10 seconds. The low fuel light near the
fuel gage still remains on in either case. SeeLow
Fuel Warning Light on page 221,Fuel Gage on
page 221, andFuel on page 394for more
information.
KEYFOB X BATTERY LOW
This message displays if a Remote Keyless
Entry (RKE) transmitter battery is low. Replace
the battery in the transmitter. See “Battery
Replacement” underRemote Keyless Entry (RKE)
System Operation on page 97. Press any of the
DIC buttons, or the trip stem, to acknowledge this
message and clear it from the DIC display.
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Tire Terminology and Denitions
Air Pressure:The amount of air inside the tire
pressing outward on each square inch of the
tire. Air pressure is expressed in pounds
per square inch (psi) or kilopascal (kPa).
Accessory Weight:This means the combined
weight of optional accessories. Some examples
of optional accessories are, automatic
transmission/transaxle, power steering, power
brakes, power windows, power seats, and
air conditioning.
Aspect Ratio:The relationship of a tire’s height
to its width.
Belt:A rubber coated layer of cords that is located
between the plies and the tread. Cords may be
made from steel or other reinforcing materials.
Bead:The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the rim.
Bias Ply Tire:A pneumatic tire in which the plies
are laid at alternate angles less than 90 degrees
to the centerline of the tread.Cold Tire Pressure:The amount of air pressure
in a tire, measured in pounds per square inch
(psi) or kilopascals (kPa) before a tire has built up
heat from driving. SeeInation - Tire Pressure
on page 456.
Curb Weight:This means the weight of a motor
vehicle with standard and optional equipment
including the maximum capacity of fuel, oil, and
coolant, but without passengers and cargo.
DOT Markings:A code molded into the sidewall
of a tire signifying that the tire is in compliance
with the U.S. Department of Transportation (DOT)
motor vehicle safety standards. The DOT code
includes the Tire Identication Number (TIN),
an alphanumeric designator which can also identify
the tire manufacturer, production plant, brand,
and date of production.
GVWR:Gross Vehicle Weight Rating.
SeeLoading Your Vehicle on page 362.
GAWR FRT:Gross Axle Weight Rating for the
front axle. SeeLoading Your Vehicle on page 362.
GAWR RR:Gross Axle Weight Rating for the
rear axle. SeeLoading Your Vehicle on page 362.
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