2004 GMC SONOMA fuel cap

Be careful not to spill fuel. Clean fuel from painted
surfaces as soon as possible. SeeCleaning the Outside
of Your Vehicle on page 5-89. When filling the tank
do not overfill by squeezing in much more fuel after the
pump shuts off.
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 3-29.
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 3-29.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

Belt:A rubber coated layer of cords that is located
between the plies and the tread. Cords may be made
from steel or other reinforcing materials.
Bead:The tire bead contains steel wires wrapped by
steel cords that hold the tire onto the rim.
Bias Ply Tire:A pneumatic tire in which the plies are
laid at alternate angles less than 90 degrees to the
centerline of the tread.
Cold Ination Pressure:The amount of air pressure in
a tire, measured in pounds per square inch (psi) or
kilopascals (kPa) before a tire has built up heat
from driving. SeeInation - Tire Pressure on page 5-67.
Curb Weight:This means the weight of a motor
vehicle with standard and optional equipment including
the maximum capacity of fuel, oil and coolant, but
without passengers and cargo.
DOT Markings:A code molded into the sidewall of a
tire signifying that the tire is in compliance with the U.S.
Department of Transportation motor vehicle safety
standards. The DOT code includes the Tire Identification
Number (TIN), an alphanumeric designator which can
also identify the tire manufacturer, production plant,
brand and date of production.GVWR:Gross Vehicle Weight Rating, seeLoading
Your Vehicle on page 4-45.
GAWR FRT:Gross Axle Weight Rating for the front
axle, seeLoading Your Vehicle on page 4-45.
GAWR RR:Gross Axle Weight Rating for the rear axle,
seeLoading Your Vehicle on page 4-45.
Intended Outboard Sidewall:The side of an
asymmetrical tire, that must always face outward when
mounted on a vehicle.
Kilopascal (kPa):The metric unit for air pressure.
There are 6.9 kPa’s to one psi.
Light Truck (LT-Metric) Tire:A tire used on light duty
trucks and some multipurpose passenger vehicles.
Load Index:An assigned number ranging from 1 to 279
that corresponds to the load carrying capacity of
a tire.
Maximum Ination Pressure:The maximum air
pressure to which a cold tire may be inflated. The
maximum air pressure is molded onto the sidewall.
Maximum Load Rating:The load rating for a tire at the
maximum permissible inflation pressure for that tire.
5-65

Vehicle Capacity Weight:The number of designated
seating positions multiplied by 150 lbs. (68 kg) plus
the rated cargo load. SeeLoading Your Vehicle
on page 4-45.
Vehicle Maximum Load on the Tire:Load on an
individual tire due to curb weight, accessory weight,
occupant weight and cargo weight.
Vehicle Placard:A label permanently attached to a
vehicle showing the original equipment tire size
and recommended inflation pressure. SeeLoading Your
Vehicle on page 4-45.
Ination - Tire Pressure
The tire and loading information label, shows the correct
inflation pressures for your tires when they’re cold.
“Cold” means your vehicle has been sitting for at least
three hours or driven no more than 1 mile (1.6 km). See
Loading Your Vehicle on page 4-45, for the location
of your vehicle’s tire and loading information label.
Notice:Don’t let anyone tell you that underination
or overination is all right. It’s not. If your tires
don’t have enough air (underination), you can get
the following:
Too much exing
Too much heat
Tire overloading
Bad wear
Bad handling
Bad fuel economy
If your tires have too much air (overination), you
can get the following:
Unusual wear
Bad handling
Rough ride
Needless damage from road hazards
When to Check
Check your tires once a month or more.
Also, check the tire pressure of the spare tire.
If you have a compact spare tire, it should be at
60 psi (420 kPa).
How to Check
Use a good quality pocket-type gage to check tire
pressure. You can’t tell if your tires are properly inflated
simply by looking at them. Radial tires may look
properly inflated even when they’re underinflated. Check
the tire’s inflation pressure when the tires are cold.
cold means your vehicle has been sitting for at least
three hours or driven no more than 1 mile (1.6 km).
5-67

Capacities and Specications
Please refer toPart E: Maintenance Record on page 6-36in the index for more information. See refrigerant change
label under the hood for charge capacity information and requirements.
ApplicationCapacities
English Metric
Air Conditioning Capacity
Air Conditioning Refrigerant R134a1.8 lbs 0.79 kg
Automatic Transmission
Drain and Refill 5.0 quarts 4.7 L
Cooling System 13.8 quarts 13.1 L
Differential Fluid
Rear Axle
Front Axle4.0 pints
2.6 pints1.9 L4
1.2 L
Engine Oil with Filter 4.5 quarts 4.3 L
Fuel Tank 17.5 gallons 67.4 L
Wheel Nut Torque 100 lb ft 140Y
All capacities are approximate. After refill, the levelmustbe checked.
All capacities are approximate. When adding, be sure to fill to the appropriate level or as recommended in this
manual. SeePart E: Maintenance Record on page 6-36
5-101

Part C: Periodic Maintenance
Inspections
Listed in this part are inspections and services which
should be performed at least twice a year (for instance,
each spring and fall).You should let your dealer’s
service department do these jobs. Make sure any
necessary repairs are completed at once.
Proper procedures to perform these services may be
found in a service manual. SeeService Publications
Ordering Information on page 7-11.
Steering, Suspension and Front
Drive Axle Boot and Seal Inspection
Inspect the front and rear suspension and steering
system for damaged, loose or missing parts, signs of
wear or lack of lubrication. Inspect the power steering
lines and hoses for proper hook-up, binding, leaks,
cracks, chafing, etc. Clean and then inspect the drive
axle boot seals for damage, tears or leakage. Replace
seals if necessary.
Exhaust System Inspection
Inspect the complete exhaust system. Inspect the body
near the exhaust system. Look for broken, damaged,
missing or out-of-position parts as well as open seams,
holes, loose connections or other conditions which
could cause a heat build-up in the floor pan or could let
exhaust fumes into the vehicle. SeeEngine Exhaust
on page 2-29.
Fuel System Inspection
Inspect the complete fuel system for damage or leaks.
Engine Cooling System Inspection
Inspect the hoses and have them replaced if they
are cracked, swollen or deteriorated. Inspect all pipes,
fittings and clamps; replace as needed. Clean the
outside of the radiator and air conditioning condenser.
To help ensure proper operation, a pressure test of
the cooling system and pressure cap is recommended
at least once a year.
6-30

Roadside Assistance Program
Security While You Travel
1-800-GMC-8782 (1-800-462-8782, Roadside
Assistance prompt)
As the proud owner of a new GMC vehicle, you are
automatically enrolled in the GMC Roadside Assistance
program. This value-added service is intended to
provide you with peace of mind as you drive in the city
or travel the open road. GMC’s Roadside Assistance
toll-free number is staffed by courteous and capable
Roadside Assistance Representatives who are available
24 hours a day, 365 days a year.
We will provide the following services during the
Bumper-to-Bumper warranty period, at no expense
to you:
•Fuel Delivery:Delivery of enough fuel
($5 maximum) for the customer to get to the
nearest service station.
•Lock-out Service (identication required):
Replacement keys or locksmith service will
be covered at no charge if you are unable to gain
entry into your vehicle. Delivery of the replacement
key will be covered within 10 miles.
•Emergency Tow:Tow to the nearest dealership for
warranty service or in the event of a
vehicle-disabling accident. Assistance when the
vehicle is mired in sand, mud or snow.
•Flat Tire Change:Installation of a spare tire will be
covered at no charge. (The customer is responsible
for the repair or replacement of the tire if not
covered by a warrantable failure.)
•Jump Start:No-start occurrences which require a
battery jump start will be covered at no charge.
•Dealer Locator Service
•Trip Routing:Your Roadside Assistance
Representative can provide you with specific
information regarding this feature.
•Trip Interruption Expense Benets:Your
Roadside Assistance Representative can provide
you with specific information regarding this feature.
In many instances, mechanical failures are covered
under GMC’s Bumper-to-Bumper warranty. However,
when other services are utilized, our Roadside
Assistance Representatives will explain any payment
obligations you might incur.
7-6

C
California Fuel.................................................. 5-5
Canada........................................................... 7-4
Canadian Owners................................................ ii
Canadian Roadside Assistance........................... 7-7
Capacities and Specifications..........................5-101
Carbon Monoxide...................4-38, 4-55, 2-11, 2-29
Care of
Safety Belts................................................5-89
Your Cassette Tape Player............................3-74
Your CD Player...........................................3-76
Your CDs ...................................................3-75
Cassette Tape Messages.................................3-56
Cassette Tape Player Service...........................6-25
CD Adapter Kits.............................................3-56
CD Messages................................3-48, 3-58, 3-73
Center High-Mounted Stoplamp (CHMSL)...........5-52
Center Passenger Position, Safety Belts.............1-21
Certification/Tire Label.....................................4-49
Chains, Tires..................................................5-74
Charging System Light....................................3-26
Check
Engine Light...............................................3-29
Gages Warning Light...................................3-34
Checking Brake Fluid......................................5-38
Checking Coolant............................................5-25
Checking Engine Oil........................................5-13
Checking the Automatic Transmission
Fluid Level.................................................5-21Checking Things Under the Hood......................5-10
Checking Your Restraint Systems......................1-53
Chemical Paint Spotting...................................5-92
Child Restraints
Child Restraint Systems...............................1-33
Infants and Young Children...........................1-29
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-39
Older Children.............................................1-27
Securing a Child Restraint Designed for
the LATCH System...................................1-41
Securing a Child Restraint in a Center
Seat Position...........................................1-43
Securing a Child Restraint in a Rear
Outside Seat Position...............................1-41
Securing a Child Restraint in the Right
Front Seat Position...................................1-44
Top Strap...................................................1-37
Top Strap Anchor Location............................1-38
Where to Put the Restraint...........................1-36
Cigarette Lighter.............................................3-17
Cleaning
Inside of Your Vehicle..................................5-86
Outside of Your Vehicle................................5-89
Underbody Maintenance...............................5-92
Weatherstrips..............................................5-89
Cleaning Aluminum Wheels..............................5-91
Cleaning Exterior Lamps/Lenses.......................5-90
Cleaning Fabric/Carpet....................................5-86
Cleaning Glass Surfaces..................................5-88
3