2004 HUMMER H2 gas type

When Should an Air Bag Inate?
An air bag is designed to inate in a moderate to severe
frontal, or near-frontal crash. The air bag will inate
only if the impact speed is above the system’s designed
'threshold level'.
If your vehicle goes straight into a wall that doesn’t
move or deform, the threshold level is about 9 to 17 mph
(14 to 27 km/h). The threshold level can vary, however,
with specic vehicle design, so that it can be somewhat
above or below this range. If your vehicle strikes
something that will move or deform, such as a parked
car, the threshold level will be higher. The air bag is not
designed to inate in rollovers, rear impacts, or in
many side impacts because ination would not help the
occupant.
In any particular crash, no one can say whether an air
bag should have inated simply because of the damage
to a vehicle or because of what the repair costs were.
Ination is determined by the angle of the impact
and how quickly the vehicle slows down in frontal or
near-frontal impacts.
The air bag system is designed to work properly under
a wide range of conditions, including off-road usage.
Observe safe driving speeds, especially on rough
terrain. As always, wear your safety belt. SeeOff-Road
Driving on page 4-17for more tips on off-road driving.
What Makes an Air Bag Inate?
In an impact of sufficient severity, the air bag sensing
system detects that the vehicle is in a crash. The
sensing system triggers a release of gas from the
inator, which inates the air bag. The inator, air bag,
and related hardware are all part of the air bag
modules inside the steering wheel and in the instrument
panel in front of the right front passenger.
How Does an Air Bag Restrain?
In moderate to severe frontal or near-frontal collisions,
even belted occupants can contact the steering wheel or
the instrument panel. Air bags supplement the
protection provided by safety belts. Air bags distribute
the force of the impact more evenly over the occupant’s
upper body, stopping the occupant more gradually.
But air bags would not help you in many types of
collisions, including rollovers, rear impacts and many
side impacts, primarily because an occupant’s motion is
not toward those air bags. Air bags should never be
regarded as anything more than a supplement to safety
belts, and then only in moderate to severe frontal or
near-frontal collisions.
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California Fuel
If your vehicle is certied to meet California Emission
Standards (see the underhood emission control label), it
is designed to operate on fuels that meet California
specications. If this fuel is not available in states
adopting California emissions standards, your vehicle
will operate satisfactorily on fuels meeting federal
specications, but emission control system performance
may be affected. The malfunction indicator lamp may
turn on (seeMalfunction Indicator Lamp on page 3-38)
and your vehicle may fail a smog-check test. If this
occurs, return to your authorized GM dealer for
diagnosis. If it is determined that the condition is caused
by the type of fuel used, repairs may not be covered
by your warranty.
Additives
To provide cleaner air, all gasolines in the United States
are now required to contain additives that will help
prevent engine and fuel system deposits from forming,
allowing your emission control system to work
properly. You should not have to add anything to your
fuel. However, some gasolines contain only the
minimum amount of additive required to meet U.S.
Environmental Protection Agency regulations. General
Motors recommends that you buy gasolines that
are advertised to help keep fuel injectors and intakevalves clean. If your vehicle experiences problems due
to dirty injectors or valves, try a different brand of
gasoline.
Gasolines containing oxygenates, such as ethers and
ethanol, and reformulated gasolines may be available in
your area to contribute to clean air. General Motors
recommends that you use these gasolines, particularly if
they comply with the specications described earlier.
Notice:Your vehicle was not designed for fuel that
contains methanol. Do not use fuel containing
methanol. It can corrode metal parts in your fuel
system and also damage the plastic and rubber
parts. That damage would not be covered under
your warranty.
Some gasolines that are not reformulated for low
emissions may contain an octane-enhancing additive
called methylcyclopentadienyl manganese tricarbonyl
(MMT); ask the attendant where you buy gasoline
whether the fuel contains MMT. General Motors does not
recommend the use of such gasolines. Fuels containing
MMT can reduce the life of spark plugs and the
performance of the emission control system may be
affected. The malfunction indicator lamp may turn on. If
this occurs, return to your authorized GM dealer for
service.
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Be careful not to spill fuel. Don’t top off or overll your
tank and wait a few seconds after you’ve nished
pumping before you remove the nozzle. Clean any
spilled fuel from painted surfaces as soon as possible.
SeeCleaning the Outside of Your Vehicle on
page 5-95.
When you put the fuel cap back on, turn it to the right
(clockwise) until you hear a clicking sound. Make
sure you fully install the cap. The diagnostic system can
determine if the fuel cap has been left off or improperly
installed. this would allow fuel to evaporate into the
atmosphere. SeeMalfunction Indicator Lamp on
page 3-38.
Notice:If you need a new fuel cap, be sure to get
the right type. Your dealer can get one for you.
If you get the wrong type, it may not t properly.
This may cause your malfunction indicator lamp to
light and may damage your fuel tank and emissions
system. SeeMalfunction Indicator Lamp on
page 3-38.Filling a Portable Fuel Container
{CAUTION:
Never ll a portable fuel container while it is in
your vehicle. Static electricity discharge from
the container can ignite the gasoline vapor.
You can be badly burned and your vehicle
damaged if this occurs. To help avoid injury to
you and others:
Dispense gasoline only into approved
containers.
Do not ll a container while it is inside a
vehicle, in a vehicle’s trunk, pickup bed or
on any surface other than the ground.
Bring the ll nozzle in contact with the
inside of the ll opening before operating
the nozzle. Contact should be maintained
until the lling is complete.
Do not smoke while pumping gasoline.
5-9

Bulb Replacement
SeeReplacement Bulbs on page 5-58for the proper
type of bulbs to use.
For any bulb changing procedure not listed in this
section, contact your dealer.
Halogen Bulbs
{CAUTION:
Halogen bulbs have pressurized gas inside and
can burst if you drop or scratch the bulb. You or
others could be injured. Be sure to read and
follow the instructions on the bulb package.
Headlamps
1. Open the hood as described earlier underHood
Release on page 5-10and locate the affected
headlamp on the inner front portion of the hood.2. Turn the bulb/socket
retainer (arrow)
counterclockwise to
unlock the bulb/socket.
You may prefer to
unplug the electrical
connector before
removing the bulb/
socket. If so, complete
Step 4 before doing
this step.
3. Pull the bulb/socket
straight out from the
headlamp housing.
5-52

Spare Tire
Your vehicle, when new, had a fully inated spare tire.
A spare tire may lose air over time, so check its
ination pressure regularly. SeeInation - Tire Pressure
on page 5-68andLoading Your Vehicle on page 4-67
for information regarding proper tire ination and loading
your vehicle. For instruction on how to remove, install
or store a spare tire, seeChanging a Flat Tire on
page 5-79.
After installing the spare tire on your vehicle, you should
stop as soon as possible and make sure the spare is
correctly inated. Have the damaged or at road
tire repaired or replaced as soon as you can and
installed back onto your vehicle. This way, a spare tire
will be available in case you need it again.
Your vehicle may have a different size spare tire than
the road tires— those originally installed on your vehicle.
This spare tires was developed for use on your
vehicle, so it’s all right to drive on it.
If your vehicle has a spare tire that does not match your
vehicle’s original road tires and wheels in size and
type, do not include the spare in the tire rotation.
Appearance Care
Remember, cleaning products can be hazardous. Some
are toxic. Others can burst into ames if you strike a
match or get them on a hot part of the vehicle. Some are
dangerous if you breathe their fumes in a closed
space. When you use anything from a container to clean
your vehicle, be sure to follow the manufacturer’s
warnings and instructions. And always open your doors
or windows when you are cleaning the inside.
Never use these to clean your vehicle:
Gasoline
Benzene
Naphtha
Carbon Tetrachloride
Acetone
Paint Thinner
Turpentine
Lacquer Thinner
Nail Polish Remover
They can all be hazardous — some more than
others — and they can all damage your vehicle, too.
5-92

ENGINE OVERHEATED..................................3-57
Entering or Exiting the Third Row Seats.............. 1-7
Entry/Exit Lighting...........................................3-17
Environmental Concerns..................................4-23
Erasing HomeLink
®Buttons..............................2-45
Event Data Records (EDR)................................ 7-9
Extender, Safety Belt.......................................1-37
Exterior Lamps...............................................3-13
F
Filter
Engine Air Cleaner......................................5-19
Finding a Program Type (PTY) Station.......3-66, 3-78
Finding a Station....................................3-64, 3-75
Finish Care....................................................5-96
Finish Damage...............................................5-99
First Aid Kit and Tool Kit..................................4-59
Fixed Mast Antenna........................................3-92
Flash-to-Pass................................................... 3-7
Flat Tire........................................................5-78
Flat Tire, Changing.........................................5-79
Fluid
Automatic Transmission................................5-21
Power Steering...........................................5-36
Windshield Washer......................................5-37
FM ...............................................................3-90
Folding the Seatback.......................................1-10
Folding the Seatbacks....................................... 1-8Following Distance..........................................4-82
Front Axle......................................................5-51
Front Receiver................................................4-60
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-43
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Low Warning Light.......................................3-43
Fuel Information Button....................................3-47
FUEL LEVEL LOW.........................................3-58
Fuses
Fuses and Circuit Breakers.........................5-102
Windshield Wiper.......................................5-102
G
Gage
Engine Coolant Temperature.........................3-35
Fuel..........................................................3-43
Oil Pressure...............................................3-41
Speedometer..............................................3-28
Tachometer.................................................3-28
Transmission Temperature.............................3-36
Voltmeter Gage...........................................3-32
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