2007 HUMMER H3 towing

Trailer Brake Control Wiring Harness
The trailer brake control wiring harness is located
under the instrument panel to the right of the
steering column. The wires are taped to the
harness that goes to the courtesy light under
the instrument panel. The harness will contain
the following wires:
Red Wire: AUX B+
Black Wire: Ground
Light Blue Wire: Brake Signal
Dark Blue Wire: Trailer Brakes
Trailer Recommendations
You must subtract your hitch loads from the
Cargo Weight Rating (CWR). CWR is the
maximum weight of the load your vehicle can
carry. It doesn’t include the weight of the people
inside, but you can gure about 150 lbs. (68 kg)
for each seat. The total cargo load must not
be more than your vehicles CWR.
Weigh your vehicle with your trailer attached,
so that you won’t go over the GVWR or GAWR.
If you are using a weight-distributing hitch,
weigh the vehicle without the spring bars in place.
You’ll get the best performance if you spread
out the weight of your load the right way, and if
you choose the correct hitch and trailer brakes.
For more information seeTowing a Trailer
on page 297.
310

CAUTION: (Continued)
You or others could be badly burned.
Stop your engine if it overheats, and get
out of the vehicle until the engine is cool.
Notice:If your engine catches re because
you keep driving with no coolant, your vehicle
can be badly damaged. The costly repairs
would not be covered by your warranty.
If No Steam Is Coming From Your
Engine
If you get an engine overheat warning but see or
hear no steam, the problem may not be too
serious. Sometimes the engine can get a little too
hot when you:
Climb a long hill on a hot day.
Stop after high-speed driving.
Idle for long periods in traffic.
Tow a trailer. See “Driving on Grades” under
Towing a Trailer on page 297.If you get the overheat warning with no sign of
steam, try this for a minute or so:
1. In heavy traffic, let the engine idle in
NEUTRAL while stopped. If it is safe to do so,
pull off the road, shift to PARK (P) or
NEUTRAL and let the engine idle.
2. Turn off the air conditioning.
3. Turn on your heater to full hot at the highest fan
speed and open the windows as necessary.
If you no longer have the overheat warning, you
can drive. Just to be safe, drive slower for
about 10 minutes. If the warning does not come
back on, you can drive normally.
If the warning continues, pull over, stop, and park
your vehicle right away.
If there is still no sign of steam, idle the engine for
three minutes while you are parked. Push down
the accelerator until the engine speed is about
twice as fast as normal idle speed for at least three
minutes while you are parked. If you still have
the warning, turn off the engine and get everyone
out of the vehicle until it cools down.
You may decide not to lift the hood but to get
service help right away.
339

Engine Fan Noise
This 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 clutch is not
engaged. This improves fuel economy and reduces
fan noise. Under heavy vehicle loading, trailer
towing and/or high outside temperatures, the
fan speed increases when the clutch 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
disengages.
Power Steering Fluid
SeeEngine
Compartment Overview
on page 322for
reservoir location.
When to Check Power Steering Fluid
It is not necessary to regularly check power
steering uid unless you suspect there is a leak
in the system or you hear an unusual noise.
A uid loss in this system could indicate a problem.
Have the system inspected and repaired.
345

(c)Visually inspect hoses and have them replaced
if they are cracked, swollen, or deteriorated.
Inspect all pipes, ttings, and clamps; replace with
genuine GM parts as needed. To help ensure
proper operation, a pressure test of the cooling
system and pressure cap and cleaning the outside
of the radiator and air conditioning condenser is
recommended at least once a year.
(d)Visually inspect wiper blades for wear or
cracking. Replace wiper blades that appear worn
or damaged or that streak or miss areas of
the windshield.
(e)Make sure the safety belt reminder light and all
your belts, buckles, latch plates, retractors, and
anchorages are working properly. Look for any
other loose or damaged safety belt system parts.
If you see anything that might keep a safety belt
system from doing its job, have it repaired. Have
any torn or frayed safety belts replaced. Also look
for any opened or broken airbag coverings, and
have them repaired or replaced. The airbag system
does not need regular maintenance.(f)Lubricate all key lock cylinders, hood latch
assembly, secondary latch, pivots, spring anchor,
release pawl, rear compartment hinges, outer
swing-gate handle pivot points, rear door detent
link, roller mechanism, swing-gate handle
pivot points, latch bolt, fuel door hinge, locks, and
folding seat hardware. More frequent lubrication
may be required when exposed to a corrosive
environment. Applying silicone grease on
weatherstrips with a clean cloth will make them
last longer, seal better, and not stick or squeak.
(g)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.
434

If an Accident Occurs
Here is what to do if you are involved in an accident.
Try to relax and then check to make sure you
are all right. If you are uninjured, make sure that
no one else in your vehicle, or the other vehicle,
is injured.
If there has been an injury, call 911 for help.
Do not leave the scene of an accident until all
matters have been taken care of. Move your
vehicle only if its position puts you in danger or
you are instructed to move it by a police officer.
Give only the necessary and requested
information to police and other parties involved
in the accident. Do not discuss your personal
condition, mental frame of mind, or anything
unrelated to the accident. This will help guard
against post-accident legal action.
If you need roadside assistance, call
GM Roadside Assistance. SeeRoadside
Assistance Program on page 454for more
information.
If your vehicle cannot be driven, know where
the towing service will be taking it. Get a card
from the tow truck operator or write down the
driver’s name, the service’s name, and the
phone number.
Remove any valuables from your vehicle before
it is towed away. Make sure this includes your
insurance information and registration if you
keep these items in your vehicle.
Gather the important information you will
need from the other driver. Things like name,
address, phone number, driver’s license
number, vehicle license plate, vehicle make,
model and model year, Vehicle Identication
Number (VIN), insurance company and policy
number, and a general description of the
damage to the other vehicle.
If possible, call your insurance company from
the scene of the accident. They will walk you
through the information they will need. If they
ask for a police report, phone or go to the police
department headquarters the next day and you
can get a copy of the report for a nominal fee. In
some states/provinces with “no fault” insurance
laws, a report may not be necessary. This is
especially true if there are no injuries and both
vehicles are driveable.
462

Power (cont.)
Steering Fluid.......................................... 345
Windows.................................................... 97
Pretensioners, Safety Belt............................. 38
Programmable Automatic Door Locks............ 94
Q
Questions and Answers About
Safety Belts............................................... 21
R
Radiator Pressure Cap................................ 338
Radios........................................................ 201
Care of Your CD Player........................... 232
Care of Your CDs.................................... 231
Navigation/Radio System,
see Navigation Manual......................... 230
Radio with CD......................................... 203
Radio with Six-Disc CD............................ 211
Setting the Time...................................... 202
Theft-Deterrent......................................... 230
Understanding Reception......................... 230
Reading Lamps........................................... 168Rear Axle.................................................... 357
Locking.................................................... 243
Rear Safety Belt Comfort Guides.................. 35
Rear Seat Passengers, Safety Belts.............. 32
Rear Storage Area...................................... 146
Rear Windshield Washer/Wiper.................... 159
Rearview Mirror, Automatic Dimming with
Compass and Temperature Display.......... 125
Rearview Mirror, Automatic Dimming
with OnStar
®, Compass and
Temperature Display................................ 122
Reclining Seatbacks...................................... 10
Recommended Fluids and Lubricants.......... 440
Recovery Loops.......................................... 287
Recreational Vehicle Towing........................ 295
Remote Keyless Entry (RKE) System............ 88
Remote Keyless Entry (RKE)
System, Operation..................................... 89
Removing the Flat Tire and Installing
the Spare Tire.......................................... 396
Removing the Spare Tire and Tools............ 393
Replacement Bulbs..................................... 365
Reporting Safety Defects
Canadian Government............................. 464
General Motors........................................ 464
United States Government....................... 464
476

Tires (cont.)
Chains..................................................... 389
Changing a Flat Tire................................ 391
Cleaning.................................................. 413
Different Size........................................... 385
If a Tire Goes Flat................................... 390
Ination - Tire Pressure............................ 375
Inspection and Rotation............................ 381
Installing the Spare Tire........................... 396
Pressure Monitor System......................... 376
Removing the Flat Tire............................. 396
Removing the Spare Tire and Tools......... 393
Spare Tire................................................ 405
Storing a Flat or Spare Tire and Tools..... 403
Tire Sidewall Labeling.............................. 368
Tire Terminology and Denitions............... 372
Uniform Tire Quality Grading.................... 386
Wheel Alignment and Tire Balance........... 387
Wheel Replacement................................. 387
When It Is Time for New Tires................. 383
Towing
Recreational Vehicle................................. 295
Towing a Trailer....................................... 297
Your Vehicle............................................. 294Traction
Control System (TCS) .............................. 241
Off Light.................................................. 184
StabiliTrak
®System................................. 244
Trailer
Recommendations.................................... 310
Transmission
Fluid, Automatic....................................... 329
Fluid, Manual........................................... 332
Up-Shift Light........................................... 181
Transmission Operation, Automatic.............. 106
Transmission Operation, Manual.................. 109
Trip Odometer............................................. 176
Turn and Lane-Change Signals................... 156
Turn Signal/Multifunction Lever.................... 155
U
Understanding Radio Reception................... 230
Uniform Tire Quality Grading....................... 386
Universal Home Remote System........132, 133
Operation........................................134, 139
Up-Shift Light.............................................. 181
479