2007 GMC SIERRA towing

Engine Fan Noise
If 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.
If your vehicle has electric cooling fans, you may
hear the fans spinning at low speed during most
everyday driving. The fans may turn off if no cooling
is required. Under heavy vehicle loading, trailer
towing, and/or high outside temperatures, or if you
are operating your air conditioning system, the fans
may change to high speed and you may hear an
increase in fan noise. This is normal and indicates
that the cooling system is functioning properly. The
fans will change to low speed when additional
cooling is no longer required.
525

(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, body door
hinges, hood latch assembly, secondary latch,
pivots, spring anchor, release pawl, tailgate hinges,
tailgate linkage, tailgate 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. Check to be sure vent hose
is unobstructed, clear, and free of debris.(h)Change automatic transmission uid and lter
if the vehicle Gross Vehicle Weight Rating
(GVWR) is over 8600 lbs or 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. This
service can be complex; you should have
your dealer perform this service. See Engine
Coolant on page 513 for 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.
630

(k)Inspect system. Check all fuel and vapor lines
and hoses for proper hook-up, routing, and
condition. Check that the purge valve, if the vehicle
has one, works properly. Replace as needed.
(l)Extreme Duty Service: Change transfer case
uid if the vehicle is mainly driven off-road in
four-wheel drive, or is used for heavy trailer towing.
Farming, mining, forestry, and Department of
Natural Resources (DNR) vehicles meet this
denition.
(m)During any maintenance, if a power washer is
used to clean mud and dirt from the underbody,
care should be taken to not directly spray the
transfer case output seals. High pressure water can
overcome the seals and contaminate the transfer
case uid. Contaminated uid will decrease the life
of the transfer case and should be replaced.
(n)Vehicles with diesel engine or with GVWR
above 10,000 lbs (4 536 kg) only: Inspect shields
for damage or looseness. Adjust or replace as
required. This is a Noise Emission Control Service.
Applicable to vehicles sold in the United States
and recommended for vehicles sold in Canada.
(p)If you drive regularly under dusty conditions,
inspect the lter or change indicator (if equipped)
at each engine oil change.(q)Visually inspect belt for fraying, excessive
cracks, or obvious damage. Replace belt if
necessary.
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 635.
At the First 100, 1,000 and
6,000 Miles (160, 1 600 and
10 000 km)
Check dual wheel nut torque. For proper torque,
seeCapacities and Specications on page 616.
631

GMC and General Motors of Canada Limited
reserve the right to limit services or reimbursement
to an owner or driver when, in their sole
discretion, the claims become excessive in
frequency or type of occurrence.
Roadside Assistance is not part of or included in
the coverage provided by the New Vehicle Limited
Warranty. GMC and General Motors of Canada
reserve the right to make any changes or
discontinue the Roadside Assistance program at
any time without notication.
Towing and Road Service Exclusions
Specically excluded from Roadside Assistance
coverage are towing or services for vehicles
operated on a non-public roadway or highway,
nes, impound towing caused by a violation
of local, Municipal, State, Provincial, or Federal
law, and mounting, dismounting or changing
of snow tires, chains, or other traction devices.
Courtesy Transportation
To enhance your ownership experience, we and
our participating dealers/retailers are proud to offer
Courtesy Transportation, a customer support
program for new vehicles.
For warranty repairs during the Bumper-to-Bumper
(U.S.) or Base Warranty Coverage period
(Canada), provided by the New Vehicle Limited
Warranty, interim transportation may be available
under the Courtesy Transportation program.
Several courtesy transportation options are
available to assist in reducing your inconvenience
when warranty repairs are required.
Courtesy Transportation is not a part of the New
Vehicle Limited Warranty and is available only
at participating dealers/retailers. A separate
booklet entitled “Warranty and Owner Assistance
Information” furnished with each new vehicle
provides detailed warranty coverage information.
653

If your vehicle is leased, the leasing company may
require you to have insurance that assures
repairs with Genuine GM Original Equipment
Manufacturer (OEM) parts or Genuine
Manufacturer replacement parts. Read your lease
carefully, as you may be charged at the end of
your lease for poor quality repairs.
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 650for 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.
659

Rear Seat Armrest...................................... 199
Rear Seat Audio (RSA)............................... 366
Rear Seat Entertainment System................. 355
Rear Seat Operation.............................. 20, 21
Rear Seat Passengers, Safety Belts.............. 39
Rearview Mirror, Automatic Dimming with
Compass and Temperature Display.......... 173
Rearview Mirror, Automatic Dimming with
OnStar
®, Compass and Temperature
Display..................................................... 169
Rearview Mirrors......................................... 169
Reclining Seatbacks...................................... 15
Recommended Fluids and Lubricants.......... 635
Recovery Hooks.......................................... 424
Recreational Vehicle Towing........................ 439
Remote Keyless Entry (RKE) System.......... 110
Remote Keyless Entry (RKE) System,
Operation................................................. 111
Removing the Flat Tire and Installing the
Spare Tire................................................ 582
Removing the Spare Tire and Tools............ 578
Replacement Bulbs..................................... 549
Reporting Safety Defects
Canadian Government............................. 662
General Motors........................................ 662
United States Government....................... 662Restraint System Check
Checking the Restraint Systems............... 104
Replacing Restraint System Parts After
a Crash................................................ 105
Retained Accessory Power (RAP)................ 134
Right Front Passenger Position,
Safety Belts............................................... 37
Roadside
Assistance Program................................. 650
Rocking Your Vehicle to Get it Out.............. 423
Routing, Engine Drive Belt.......................... 639
Running the Engine While Parked............... 168
S
Safety Belt
Passenger Reminder Light....................... 249
Pretensioners............................................. 44
Reminder Light........................................ 249
Safety Belts
Care of.................................................... 601
Center Front Passenger Position......... 37, 38
Driver Position........................................... 28
How to Wear Safety Belts Properly............ 27
Questions and Answers About
Safety Belts............................................ 26
676

Tires (cont.)
If a Tire Goes Flat................................... 576
Ination - Tire Pressure............................ 559
Inspection and Rotation............................ 565
Installing the Spare Tire........................... 582
Pressure Monitor System......................... 561
Removing the Flat Tire............................. 582
Removing the Spare Tire and Tools......... 578
Secondary Latch System......................... 589
Spare Tire................................................ 596
Storing a Flat or Spare Tire and Tools..... 592
Tire Sidewall Labeling.............................. 551
Tire Terminology and Denitions............... 556
Uniform Tire Quality Grading.................... 571
Wheel Alignment and Tire Balance........... 572
Wheel Replacement................................. 573
When It Is Time for New Tires................. 568
Tow/Haul Mode........................................... 144
Tow/Haul Mode Light................................... 266
Towing
Recreational Vehicle................................. 439
Towing a Trailer....................................... 445
Your Vehicle............................................. 439
Traction
StabiliTrak
®System................................. 381Trailer
Recommendations.................................... 482
Transmission
Fluid, Automatic....................................... 508
Transmission Operation, Automatic.............. 138
Trip Odometer............................................. 248
Truck-Camper Loading Information.............. 436
Turn and Lane-Change Signals................... 213
Turn Signal/Multifunction Lever.................... 212
U
Ultrasonic Rear Parking Assist (URPA)........ 228
Understanding Radio Reception................... 369
Uniform Tire Quality Grading....................... 571
Universal Home Remote System................. 185
Operation........................................185, 189
System Identication................................ 184
V
Vehicle
Control..................................................... 378
Damage Warnings....................................... 5
Loading.................................................... 425
Symbols...................................................... 5
679