2004 HUMMER H2 coolant level

{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can boil
before the proper coolant mixture will.
Yourvehicle’s coolant warning system is set
for the proper coolant mixture. With plain
water or the wrong mixture, your engine could
get too hot but you would not get the overheat
warning. Your engine could catch re and you
or others could be burned. Use a 50/50 mixture
of clean, drinkable water and DEX-COOL
®
coolant.
Notice:In cold weather, water can freeze and crack
the engine, radiator, heater core and other parts.
Use the recommended coolant and the proper
coolant mixture.
{CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it will burn if the engine parts are hot
enough. Do not spill coolant on a hot engine.
1. Park the vehicle on a level surface.
2. Locate the coolant
surge tank pressure
cap that has this label.
You can remove the coolant surge tank pressure
capwhen the cooling system, including the
coolant surge tank pressure cap and upper radiator
hose, are no longer hot. Turn the pressure cap
slowly counterclockwise (left) about one full turn. If
you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
5-33

5. With the coolant surge tank pressure cap off, start
the engine and let it run until you can feel the upper
radiator hose getting hot. Watch out for the
engine cooling fan.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge tank
until the level reaches FULL COLD mark.
6. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
Engine Fan Noise
Your vehicle has a clutched engine cooling fan. When
the clutch is engaged, the fan spins faster to provide
more air to cool the engine.
In most everyday driving conditions, the fan is spinning
slower and the clutch is not fully engaged. This
improves fuel economy and reduces fan noise. Under
heavy vehicle loading, trailer towing and/or high outside
temperatures, the fan speed increases as the clutch
more fully engages. So you may hear an increase in fan
noise. This is normal and should not be mistaken as
the transmission slipping or making extra shifts. It
is merely the cooling system functioning properly. The
fan will slow down when additional cooling is not
required and the clutch disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch partially
disengages.
5-35

Open the cap with the washer symbol on it. Add washer
uid until the tank is full.
Notice:
When using concentrated washer uid, follow
the manufacturer’s instructions for adding
water.
Do not mix water with ready-to-use washer uid.
Water can cause the solution to freeze and
damage your washer uid tank and other parts
of the washer system. Also, water does not
clean as well as washer uid.
Fill your washer uid tank only three-quarters
full when it is very cold. This allows for
expansion if freezing occurs, which could
damage the tank if it is completely full.
Do not use engine coolant (antifreeze) in your
windshield washer. It can damage your washer
system and paint.
Brakes
Brake Fluid
Your brake master cylinder
reservoir is lled with
DOT-3 brake uid. See
Engine Compartment
Overview on page 5-12for
the location of the
reservoir.
There are only two reasons why the brake uid level in
the reservoir might go down. The rst is that the
brake uid goes down to an acceptable level during
normal brake lining wear. When new linings are put in,
the uid level goes back up. The other reason is
that uid is leaking out of the brake system. If it is, you
should have your brake system xed, since a leak
means that sooner or later your brakes will not work
well, or will not work at all.
5-38

When the CHANGE ENGINE OIL light appears, certain
services, checks and inspections are required.
Required services are described in the following for
“MaintenanceI” and “MaintenanceII.” Generally,
it is recommended that your rst service be
MaintenanceI, your second service be MaintenanceII
and that you alternate MaintenanceIand MaintenanceII
thereafter. However, in some cases, MaintenanceII
may be required more often.MaintenanceI— Use MaintenanceIif the CHANGE
ENGINE OIL light comes on within ten months since
vehicle was purchased or MaintenanceIIwas
performed.
MaintenanceII— Use MaintenanceIIif the previous
service performed was MaintenanceI. Always use
MaintenanceIIwhenever the light comes on ten months
or more since the last service or if the light has not
come on at all for one year.
Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. Reset oil life system. SeeEngine Oil on
page 5-14.An Emission Control Service.••
Lubricate chassis components.See footnote #.••
Visually check for any leaks or damage.See footnote (j).••
Inspect engine air cleaner lter. If necessary, replace lter. SeeEngine Air
Cleaner/Filter on page 5-19.An Emission Control Service. See footnote †.••
Rotate tires and check ination pressures and wear. SeeTires on page 5-60.••
Inspect brake system.See footnote (a).••
Check engine coolant and windshield washer uid levels and add uid as
needed.••
Perform any needed additional services. See “Additional Required Services” in
this section.••
6-5

(g)Add uid as needed. (A uid loss could indicate a
problem; repair as needed.) Check vent hose at transfer
case for kinks and proper installation.
(h)Change automatic transmission uid and lter if the
vehicle is mainly driven under one or more of these
conditions:
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police or delivery
service.
(i)Drain, ush and rell cooling system. See Engine
Coolant on page 5-24for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and ller neck.
Pressure test the cooling system and pressure cap.
(j)A uid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the uid level checked. Add uid if needed.Owner Checks and Services
These owner checks and services should be performed
at the intervals specied to help ensure the safety,
dependability and emission control performance of your
vehicle. Your GM Goodwrench dealer can assist you
with these checks and services.
Be sure any necessary repairs are completed at once.
Whenever any uids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
inRecommended Fluids and Lubricants on page 6-12.
At Each Fuel Fill
It is important to perform these underhood checks at
each fuel ll.
Engine Oil Level Check
Check the engine oil level and add the proper oil if
necessary. SeeEngine Oil on page 5-14for further
details.
Notice:It is important to check your oil regularly
and keep it at the proper level. Failure to keep your
engine oil at the proper level can cause damage
to your engine not covered by your warranty.
6-9

Engine Coolant Level Check
Check the engine coolant level and add
DEX-COOL®coolant mixture if necessary. SeeEngine
Coolant on page 5-24for further details.
Windshield Washer Fluid Level Check
Check the windshield washer uid level in the windshield
washer tank and add the proper uid if necessary.
At Least Once a Month
Tire Ination Check
Visually inspect your tires and make sure tires are
inated to the correct pressures. Do not forget to check
your spare tire. SeeTires on page 5-60for further
details. Check to make sure the spare tire is stored
securely. Push, pull and then try to rotate or turn
the spare tire. If it moves, tighten it. SeeChanging a
Flat Tire on page 5-79.
At Least Once a Year
Starter Switch Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle.
2. Firmly apply both the parking brake and the regular
brake. SeeParking Brake on page 2-29if
necessary.
Do not use the accelerator pedal, and be ready to
turn off the engine immediately if it starts.
3. Try to start the engine in each gear. The starter
should work only in PARK (P) or NEUTRAL (N).
If the starter works in any other position, contact
your GM Goodwrench dealer for service.
6-10

Care of (cont.)
Your CD Player...........................................3-92
Your CDs ...................................................3-92
Cargo Area Door Lock Switch............................ 2-8
Cargo Tie Downs............................................2-49
Cassette Tape Messages.................................3-71
CD Adapter Kits.............................................3-71
CD Messages........................................3-74, 3-86
Center Console Storage Area...........................2-46
Center High-Mounted Stoplamp (CHMSL)...........5-57
Center Instrument Panel Fuse Block................5-105
Center Overhead Console................................2-46
Center Roof Marker Lamps..............................5-56
Chains, Tire...................................................5-75
CHANGE ENGINE OIL....................................3-56
Charging System Light....................................3-32
Check Engine Light.........................................3-38
CHECK OIL LEVEL.........................................3-56
CHECK WASHER FLUID.................................3-59
Checking Brake Fluid......................................5-39
Checking Coolant............................................5-26
Checking Engine Oil........................................5-14
Checking Things Under the Hood......................5-10
Checking Your Restraint Systems......................1-73
Chemical Paint Spotting...................................5-99
Child Restraints
Child Restraint Systems...............................1-44
Infants and Young Children...........................1-40
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-50Child Restraints (cont.)
Older Children.............................................1-38
Securing a Child Restraint Designed for the
LATCH System........................................1-52
Securing a Child Restraint in a Rear Seat
Position..................................................1-53
Securing a Child Restraint in the Right Front
Seat Position...........................................1-55
Top Strap...................................................1-48
Top Strap Anchor Location............................1-49
Where to Put the Restraint...........................1-47
Chime Level Adjustment..................................3-92
Cigarette Lighter.............................................3-18
Cleaning
Inside of Your Vehicle..................................5-93
Outside of Your Vehicle................................5-95
Underbody Maintenance...............................5-99
Weatherstrips..............................................5-95
Cleaning Aluminum or Chrome-Plated Wheels.....5-98
Cleaning Exterior Lamps/Lenses.......................5-96
Cleaning Fabric/Carpet....................................5-93
Cleaning Glass Surfaces..................................5-94
Cleaning Interior Plastic Components.................5-94
Cleaning Leather............................................5-93
Cleaning the Mirror.........................................2-37
Cleaning the Speaker Covers...........................5-94
Cleaning the Top of the Instrument Panel...........5-94
Cleaning the Video Screen...............................3-92
3

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
6