2004 GMC SONOMA heater

When the engine is cold, the coolant level should be at
least up to the ADD mark. If it isn’t, you may have a
leak at the pressure cap or in the radiator hoses, heater
hoses, radiator, water pump or somewhere else in
the cooling system.
{CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Do not touch them. If
you do, you can be burned.
Do not run the engine if there is a leak. If you
run the engine, it could lose all coolant. That
could cause an engine re, and you could be
burned. Get any leak xed before you drive the
vehicle.If there seems to be no leak, start the engine again.
The engine cooling fan speed should increase when idle
speed is doubled by pushing the accelerator pedal
down. If it doesn’t, your vehicle needs service. Turn off
the engine.
Notice:Engine damage from running your engine
without coolant is not covered by your warranty.
Notice:Using coolant other than DEX-COOL
®may
cause premature engine, heater core or radiator
corrosion. In addition, the engine coolant may
require changing sooner, at 30,000 miles (50 000 km)
or 24 months, whichever occurs rst. Any repairs
would not be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your vehicle.
5-29

How to Add Coolant to the Coolant
Recovery Tank
If you haven’t found a problem yet, but the coolant level
isn’t at the ADD mark, add a 50/50 mixture ofclean,
drinkable waterand DEX-COOL
®engine coolant at the
coolant recovery tank. SeeEngine Coolant on
page 5-23for more information.
{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. Your
vehicle’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.
5-30

Cleaning Interior Plastic Components.................5-88
Cleaning Leather............................................5-88
Cleaning the Mirror.........................................2-31
Cleaning the Photocells...................................2-31
Cleaning the Top of the Instrument Panel...........5-88
Cleaning the Windshield and Wiper Blades.........5-91
Cleaning Tires................................................5-91
Cleaning Vinyl................................................5-88
Cleaning Wood Panels....................................5-88
Climate Control System...................................3-18
Outlet Adjustment........................................3-20
Compact Spare Tire........................................5-85
Content Theft-Deferrent....................................2-14
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-28
Heater, Engine............................................2-19
Cooling System..............................................5-28
Cruise Control.................................................. 3-9
Current and Past Model Order Forms................7-12
Customer Assistance Information
Courtesy Transportation.................................. 7-7
Customer Assistance for Text Telephone
(TTY) Users.............................................. 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Program for Persons with
Disabilities................................................ 7-5
Reporting Safety Defects to General Motors....7-11Customer Assistance Information (cont.)
Reporting Safety Defects to the Canadian
Government............................................7-11
Reporting Safety Defects to the United States
Government............................................7-10
Roadside Assistance Program......................... 7-6
Service Publications Ordering Information........7-11
D
Daytime Running Lamps..................................3-13
Defensive Driving............................................. 4-2
Defogging and Defrosting.................................3-19
Doing Your Own Service Work........................... 5-3
Dome Lamp...................................................3-16
Door
Locks.......................................................... 2-7
Power Door Locks......................................... 2-8
Programmable Automatic Door Locks............... 2-8
Rear Door Security Locks.............................2-10
Driver
Position, Safety Belt.....................................1-14
Driver Information Center (DIC).........................2-38
Driving
At Night.....................................................4-27
City...........................................................4-32
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-33
4

Driving (cont.)
Hill and Mountain Roads..............................4-36
In Rain and on Wet Roads...........................4-29
Winter........................................................4-38
Driving Across an Incline..................................4-22
Driving Downhill..............................................4-21
Driving in Mud, Sand, Snow or Ice....................4-25
Driving in Water..............................................4-26
Driving On Grades..........................................4-62
Driving on Off-Road Hills.................................4-18
Driving on Snow or Ice....................................4-39
Driving Through Deep Standing Water...............4-31
Driving Through Flowing Water.........................4-31
Driving Uphill..................................................4-19
Driving with a Trailer.......................................4-60
E
Electrical System
Add-On Equipment......................................5-94
Fuses and Circuit Breakers...........................5-95
Headlamps.................................................5-95
Power Windows and Other Power Options......5-95
Windshield Wiper Fuses...............................5-95
Emissions Inspection and
Maintenance Programs.................................3-31Engine
Air Cleaner/Filter.........................................5-18
Battery.......................................................5-40
Check and Service Engine Soon Light............3-29
Coolant......................................................5-23
Coolant Heater............................................2-19
Coolant Temperature Gage...........................3-28
Cooling System Inspection............................6-30
Drive Belt Routing.......................................6-35
Engine Compartment Overview......................5-12
Exhaust.....................................................2-29
Fan Noise..................................................5-35
Oil .............................................................5-13
Overheating................................................5-26
Starting......................................................2-18
Engine Compartment Fuse Block......................5-98
Engine Coolant Level Check.............................6-25
Engine Oil Additives........................................5-16
Engine Oil Level Check...................................6-25
Engine Speed Control.....................................2-19
Entry Lighting.................................................3-15
Environmental Concerns..................................4-15
Event Data Records (EDR)................................ 7-9
Exit Lighting...................................................3-15
Express Down Window....................................2-13
Extender, Safety Belt.......................................1-26
Exterior Lamps...............................................3-11
5

Steering in Emergencies..................................4-10
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection..............................6-30
Steering Tips................................................... 4-9
Storage
Garment Hooks...........................................2-40
Storage Areas
Front Storage Area......................................2-40
Glove Box..................................................2-33
Luggage Carrier..........................................2-40
Overhead Console.......................................2-33
Storing a Flat or Spare Tire and Tools...............5-83
Stuck in Sand, Mud, Ice or Snow......................4-42
Sun Visors.....................................................2-14
Sunglasses Storage Compartment.....................2-37
Sunroof.........................................................2-42
T
Tachometer....................................................3-24
Tailgate.........................................................2-11
Tailgate Lubrication Service..............................6-27
Taillamps.......................................................5-53
Temperature and Compass Display....................2-36
Testing the Alarm............................................2-15
Theft-Deterrent, Radio.....................................3-73Theft-Deterrent Systems...................................2-14
Content Theft-Deterrent................................2-14
Passlock
®...................................................2-16
Throttle System Inspection...............................6-31
Tilt Wheel........................................................ 3-5
Time Delay....................................................2-31
Tire Inflation Check.........................................6-25
Tire Sidewall Labeling......................................5-58
Tire Size.......................................................5-63
Tire Terminology and Definitions........................5-64
Tires.............................................................5-57
Buying New Tires........................................5-70
Chains.......................................................5-74
Changing a Flat Tire....................................5-75
Compact Spare Tire.....................................5-85
If a Tire Goes Flat.......................................5-74
Inflation - Tire Pressure................................5-67
Inspection and Rotation................................5-68
Uniform Tire Quality Grading.........................5-71
Wheel Alignment and Tire Balance.................5-72
Wheel Replacement.....................................5-72
When It Is Time for New Tires......................5-69
To Use the Engine Coolant Heater....................2-19
Top Strap......................................................1-37
Top Strap Anchor Location...............................1-38
Torque Lock...................................................2-28
14