2009 HUMMER H3 manual transmission

Parking on Hills
{CAUTION
Parking the vehicle on a hill with
the trailer attached can be
dangerous. If something goes
wrong, the rig could start to move.
People can be injured, and both
the vehicle and the trailer can be
damaged. When possible, always
park the rig on a at surface.
If parking the rig on a hill:
1. Press the brake pedal, but do
not shift into P (Park) yet for
vehicles with an automatic
transmission, or into gear for
vehicles with a manual
transmission. Turn the wheels
into the curb if facing downhill or
into traffic if facing uphill.2. Have someone place chocks
under the trailer wheels.
3. When the wheel chocks are in
place, release the brake pedal
until the chocks absorb the load.
4. Reapply the brake pedal.
Then apply the parking brake and
shift into P (Park) for vehicles
with an automatic transmission or
into gear for vehicles with a
manual transmission.
5. Release the brake pedal.
Leaving After Parking on
a Hill
The vehicle has a Hill Start Assist
feature, which may be useful
when stopped on a grade. See
Braking on page 4-3for more
information.
1. Apply and hold the brake pedal
while you:
start the engine,
shift into a gear, and
release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is
clear of the chocks.
4. Stop and have someone pick up
and store the chocks.
4-50 Driving Your Vehicle

Maintenance When Trailer
Towing
The vehicle needs service more
often when pulling a trailer. See this
manual’s Maintenance Schedule
or Index for more information.
Things that are especially important
in trailer operation are automatic
transmission uid, engine oil,
axle lubricant, belts, cooling system
and brake system. It is a good
idea to inspect these before and
during the trip.
Check periodically to see that all
hitch nuts and bolts are tight.
Trailer Wiring Harness
Light-Duty Trailer Wiring Package
If the vehicle does not have a
trailer towing package, the chassis
harness will contain the following
blunt cut circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn
Signal
White: Ground
Brown: Tail Lamps
To add a trailer towing wiring
package, have it installed by your
dealer/retailer or a qualied
service center. Also, seeAdd-On
Electrical Equipment on page 5-91
for more information.Heavy-Duty Trailer Wiring
Package
If the vehicle has a trailer towing
package, the rear bumper harness
will have a seven-pin universal
heavy-duty trailer connector
attached to a bracket on the hitch
platform.
Driving Your Vehicle 4-51

Service and
Appearance Care
Service
Service...............................5-3
Accessories and
Modications.....................5-3
California Proposition
65 Warning.......................5-4
California Perchlorate
Materials Requirements.....5-4
Doing Your Own
Service Work....................5-4
Adding Equipment to the
Outside of the Vehicle........5-5
Fuel
Fuel....................................5-5
Gasoline Octane.................5-5
Gasoline Specications.......5-5
California Fuel....................5-5
Additives.............................5-6
Fuels in Foreign
Countries..........................5-7
Filling the Tank...................5-7
Filling a Portable Fuel
Container..........................5-8
Checking Things Under
the Hood
Checking Things Under
the Hood..........................5-9
Hood Release.....................5-9
Engine Compartment
Overview.........................5-10
Engine Oil.........................5-13
Engine Oil Life System.....5-15
Engine Air Cleaner/Filter. . .5-17
Automatic Transmission
Fluid................................5-18
Manual Transmission
Fluid................................5-20
Hydraulic Clutch................5-21
Cooling System.................5-22
Engine Coolant.................5-23
Engine Overheating...........5-27
Engine Fan Noise.............5-28
Power Steering Fluid.........5-29
Windshield Washer Fluid. . .5-30
Brakes..............................5-30
Battery..............................5-33
Jump Starting...................5-34
Rear Axle
Rear Axle.........................5-38
Four-Wheel Drive
Four-Wheel Drive..............5-38
Front Axle
Front Axle.........................5-39
Headlamp Aiming
Headlamp Aiming..............5-39
Bulb Replacement
Bulb Replacement.............5-41
Halogen Bulbs..................5-41
Headlamps........................5-41
Taillamps, Turn Signal,
Stoplamps and Back-up
Lamps (H3)
.....................5-42
Taillamps, Turn Signal,
Stoplamps and Back-up
Lamps (H3T)
...................5-42
License Plate Lamp..........5-43
Replacement Bulbs...........5-43
Service and Appearance Care 5-1

It does not take much uid,
generally less than one pint (0.5 L).
Do not overll.
Notice:Use of the incorrect
automatic transmission uid may
damage the vehicle, and the
damages may not be covered
by the vehicle’s warranty. Always
use the automatic transmission
uid listed inRecommended
Fluids and Lubricants on
page 6-12.
After adding uid, recheck the
uid level as described under
“How to Check Automatic
Transmission Fluid,” earlier
in this section.
When the correct uid level is
obtained, push the dipstick
back in all the way; then ip
the handle down to lock
the dipstick in place.
Manual Transmission
Fluid
When to Check
A good time to check the manual
transmission uid is when the
engine oil is changed. However,
the uid in the manual transmission
does not require changing.
How to Check
Because this operation can be a
little difficult, you may choose
to have this done at your GM
dealer/retailer service department.
If doing it yourself, be sure to follow
all the instructions here, or there
could be a false reading.Notice:Too much or too little
uid can damage your
transmission. Too little uid
could cause the transmission to
overheat. Be sure to get an
accurate reading if you check
your transmission uid.
To check the uid:
1. Park the vehicle on a level
surface, then shut the engine off.
Let the vehicle sit until the
transmission case is cool enough
to touch.
2. Remove the ller plug.
5-20 Service and Appearance Care

Jump Starting
If the vehicle’s battery has run
down, you may want to use another
vehicle and some jumper cables
to start your vehicle. Be sure to use
the following steps to do it safely.
{CAUTION
Batteries can hurt you. They can
be dangerous because:
They contain acid that can
burn you.
They contain gas that can
explode or ignite.
They contain enough
electricity to burn you.
If you do not follow these steps
exactly, some or all of these
things can hurt you.Notice:Ignoring these steps
could result in costly damage to
the vehicle that would not be
covered by the warranty.
Trying to start the vehicle by
pushing or pulling it will not work,
and it could damage the vehicle.
1. Check the other vehicle.
It must have a 12-volt battery
with a negative ground system.
Notice:If the other vehicle’s
system is not a 12-volt system
with a negative ground, both
vehicles can be damaged. Only
use vehicles with 12-volt systems
with negative grounds to jump
start your vehicle.2. Get the vehicles close enough so
the jumper cables can reach,
but be sure the vehicles are not
touching each other. If they
are, it could cause a ground
connection you do not want.
You would not be able to start
your vehicle, and the bad
grounding could damage the
electrical systems.
To avoid the possibility of the
vehicles rolling, set the parking
brake rmly on both vehicles
involved in the jump start
procedure. Put an automatic
transmission in P (Park) or
a manual transmission in
Neutral before setting the
parking brake. If you have a
four-wheel-drive vehicle,
be sure the transfer case is
not in Neutral.
5-34 Service and Appearance Care

Capacities and Specications (cont’d)
ApplicationCapacities
English Metric
Transfer Case 1.6 qt1.5 L
Transmission (Drain and Rell) 3.7L L5 and 5.3L V8, Automatic Transmission 5.0 qt4.7 L
3.7L L5, Manual Transmission 2.5 qt2.4 L
Wheel Nut Torque 100 lb ft140Y
All capacities are approximate. When adding, be sure to ll to the approximate level, as recommended in this
manual.
Engine Specications
Engine VIN CodeTransmission Spark Plug Gap
3.7L L5 EAutomatic
Manual .040 in (1.01 mm)
5.3L V8 LAutomatic .040 in (1.01 mm)
Service and Appearance Care 5-97

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 starting this check, be
sure there is enough room
around the vehicle.
2. Firmly apply both the parking
brake and the regular brake.
SeeParking Brake on page 2-28.
Do not use the accelerator
pedal, and be ready to turn off
the engine immediately if it starts.3. For automatic transmission
vehicles, try to start the engine
in each gear. The vehicle
should start only in P (Park) or
N (Neutral). If the vehicle starts
in any other position, contact
your dealer/retailer for service.
For manual transmission
vehicles, put the shift lever in
Neutral, push the clutch
pedal down halfway, and try to
start the engine. The vehicle
should start only when the clutch
pedal is pushed down all the
way to the oor. If the vehicle
starts when the clutch pedal
is not pushed all the way down,
contact your dealer/retailer
for service.
Automatic Transmission Shift
Lock Control System 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 starting this check, be
sure there is enough room
around the vehicle. It should be
parked on a level surface.
2. Firmly apply the parking brake.
SeeParking Brake on page 2-28.
Be ready to apply the regular
brake immediately if the vehicle
begins to move.
3. With the engine off, turn the
ignition to ON/RUN, but do not
start the engine. Without applying
the regular brake, try to move
the shift lever out of P (Park) with
normal effort. If the shift lever
moves out of P (Park), contact
your dealer/retailer for service.
6-10 Maintenance Schedule

Ignition Transmission Lock
Check
While parked, and with the parking
brake set, try to turn the ignition
to LOCK/OFF in each shift lever
position.
For automatic transmission
vehicles, the ignition should turn
to LOCK/OFF only when the
shift lever is in P (Park).
The ignition key should
come out only in LOCK/OFF.
For manual transmission
vehicles, the ignition key should
come out only in LOCK/OFF.
Contact your dealer/retailer if service
is required.
Parking Brake and Automatic
Transmission P (Park)
Mechanism Check
{CAUTION
When you are doing this check,
the vehicle could begin to move.
You or others could be injured
and property could be damaged.
Make sure there is room in front
of the vehicle in case it begins to
roll. Be ready to apply the regular
brake at once should the vehicle
begin to move.
Park on a fairly steep hill, with the
vehicle facing downhill. Keeping
your foot on the regular brake, set
the parking brake.
To check the parking brake’s
holding ability: With the engine
running and transmission in
N (Neutral), slowly remove footpressure from the regular brake
pedal. Do this until the vehicle
is held by the parking brake only.
To check the P (Park)
mechanism’s holding ability:
With the engine running, shift to
P (Park). Then release the
parking brake followed by the
regular brake.
Contact your dealer/retailer if
service is required.
Underbody Flushing Service
At least every spring, use plain
water to ush any corrosive
materials from the underbody.
Take care to clean thoroughly
any areas where mud and other
debris can collect.
Maintenance Schedule 6-11