heater GMC SIERRA 2003 User Guide

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 isn’t covered by your warranty.
See“Overheated Engine Protection Operating
Mode”in the Index for information on driving to a
safe place in an emergency.
Notice:When adding coolant, it is important that
you use only DEX-COOL
®(silicate-free) coolant.
If coolant other than DEX-COOL®is added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the engine
coolant will require change sooner—at 30,000 miles
(50 000 km) or 24 months, whichever occursfirst.
Damage caused by the use of coolant other
than DEX-COOL
®is not covered by your new vehicle
warranty.
How to Add Coolant to the Coolant
Surge Tank
If you haven’t found a problem yet, check to see if
coolant is visible in the surge tank. If coolant is visible
but the coolant level isn’t at or above the FULL
COLD mark, add a 50/50 mixture ofclean, drinkable
waterand DEX-COOL
®coolant at the coolant
surge tank, but be sure the cooling system, including
the coolant surge tank pressure cap, is cool before you
do it. SeeEngine Coolant on page 5-23for more
information.
{CAUTION:
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They
are under pressure, and if you turn the coolant
surge tank pressure cap -- even a little -- they
can come out at high speed. Never turn the
cap when the cooling system, including the
coolant surge tank pressure cap, is hot. Wait
for the cooling system and coolant surge tank
pressure cap to cool if you ever have to turn
the pressure cap.
5-30
2003 - Sierra Denali

{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.
CAUTION: (Continued)
CAUTION: (Continued)
With plain water or the wrong mixture, your
engine could get too hot but you wouldn’t get
the overheat warning. Your engine could catch
fire 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. Don’t spill coolant on a hot engine.
5-31
2003 - Sierra Denali

*1—Gasoline Engine and Diesel Engine.
*2—Gasoline Engine; ECMRPV—Diesel Engine.
*3—Gasoline Engine; FUEL HT—Diesel Engine.
*4—Gasoline Engine; ECM I—Diesel Engine.
*5—IGN/EDU
Fuses Usage
GLOW PLUGDiesel Glow Plugs and Intake
Air Heater
CUST FEED Gasoline Accessory Power
STUD #1Auxiliary Power (Single
Battery and Diesels Only)/
Dual Battery (TP2) Do not
install fuse.
MBECMid Bussed Electrical Center
Power Feed, Front Seats,
Right Doors
BLOWER Front Climate Control Fan
LBECLeft Bussed Electrical Center,
Door Modules, Door Locks,
Auxiliary Power Outlet—Rear
Cargo Area and Instrument
Panel
STUD 2Accessory Power/Trailer
Wiring Brake Feed
ABS Anti-Lock Brakes
Fuses Usage
VSES/ECAS Vehicle Stability
IGN A Ignition Power
IGN B Ignition Power
LBEC 1Left Bussed Electrical Center,
Left Doors, Truck Body
Controller, Flasher Module
TRL PARK Parking Lamps Trailer Wiring
RR PARKRight Rear Parking and
Sidemarker Lamps
LR PARKLeft Rear Parking and
Sidemarker Lamps
PARK LP Parking Lamps Relay
STARTER Starter Relay
INTPARK Interior Lamps
STOP LP Stoplamps
TBC BATTTruck Body Controller
Battery Feed
SUNROOF Sunroof
SEO B2 Off-Road Lamps
4WSVent Solenoid
Canister/Quadrasteer Module
Power
RR HVAC Not Used
AUX PWRAuxiliary Power
Outlet—Console
5-97
2003 - Sierra Denali

Cleaning the Windshield and Wiper Blades.........5-86
Cleaning Tires................................................5-87
Cleaning Vinyl................................................5-83
Cleaning Wood Panels....................................5-84
Climate Control System
Dual Automatic............................................3-18
Compact Disc Changer Errors..........................3-75
Compact Disc Messages..................................3-70
Compass Calibration.......................................2-30
Compass Variance..........................................2-29
Content Theft-Deterrent....................................2-13
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-36
Heater, Engine............................................2-18
Surge Tank Pressure Cap.............................5-26
Cooling System..............................................5-29
Cruise Control.................................................. 3-8
Cruise Control Light........................................3-40
Cupholder(s)..................................................2-39
Current and Past Model Order Forms................7-10
Customer Assistance Information
Courtesy Transportation
.................................. 7-7
Customer Assistance for Text Telephone (TTY)
Users
....................................................... 7-3
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
...... 7-9Customer Assistance Information (cont.)
Reporting Safety Defects to the Canadian
Government.............................................. 7-9
Reporting Safety Defects to the United States
Government.............................................. 7-8
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information......... 7-9
D
Daytime Running Lamps..................................3-13
Defensive Driving............................................. 4-2
Defogging and Defrosting.................................3-22
Doing Your Own Service Work........................... 5-3
Dome Lamps .................................................3-16
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7
Programmable Automatic Door Locks............... 2-7
Rear Doors.................................................. 2-9
Driver
Position, Safety Belt.....................................1-12
DRIVER DOOR AJAR.....................................3-56
Driver Information Center (DIC).........................3-42
DIC Operation and Displays..........................3-42
DIC Warnings and Messages........................3-51
Driving
At Night.....................................................4-30
City ...........................................................4-35
Defensive..................................................... 4-2
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2003 - Sierra Denali

Driving (cont.)
Drunken....................................................... 4-2
Freeway.....................................................4-36
Hill and Mountain Roads..............................4-38
In Rain and on Wet Roads...........................4-32
Winter........................................................4-40
Driving Across an Incline..................................4-27
Driving Downhill..............................................4-25
Driving in Mud, Sand, Snow or Ice....................4-28
Driving in Water..............................................4-29
Driving On Grades..........................................4-59
Driving on Off-Road Hills.................................4-23
Driving on Snow or Ice....................................4-40
Driving Through Deep Standing Water...............4-34
Driving Through Flowing Water.........................4-34
Driving Uphill..................................................4-24
Driving with a Trailer.......................................4-58
Dual Automatic Climate Control System.............3-18
E
Easy Exit Seat...............................................2-42
Electrical System
Add-On Equipment......................................5-91
Fuses and Circuit Breakers...........................5-91
Power Windows and Other Power Options......5-91
Windshield Wiper Fuses...............................5-91
Electrochromic Mirror Operation........................2-28
Emissions Inspection and Maintenance
Programs...................................................3-39Engine
Air Cleaner/Filter
.........................................5-18
Battery
.......................................................5-39
Check and Service Engine Soon Light
............3-37
Compartment Overview
................................5-12
Coolant
......................................................5-23
Coolant Heater
............................................2-18
Coolant Temperature Gage
...........................3-36
Cooling System Inspection
............................6-14
Exhaust
.....................................................2-26
Fan Noise
..................................................5-34
Oil
.............................................................5-13
Overheating
................................................5-26
Starting
......................................................2-17
ENGINE COOLANT HOT
.................................3-52
Engine Coolant Level Check
.............................6-10
Engine Hour Meter Display
...............................3-26
Engine Oil Additives
........................................5-16
Engine Oil Level Check
...................................6-10
ENGINE OVERHEATED
..................................3-52
Entry Lighting
.................................................3-15
Environmental Concerns
..................................4-20
Erasing HomeLink
®Buttons
..............................2-38
Exit Lighting
...................................................3-15
Express-Down Windows
...................................2-12
Extender, Safety Belt
.......................................1-28
Exterior Lamps
...............................................3-11
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2003 - Sierra Denali

T
Tachometer....................................................3-26
Tailgate.........................................................2-10
Tailgate Removal............................................2-10
Taillamps.......................................................5-54
Temperature and Compass Display....................2-28
Testing the Alarm............................................2-14
Theft-Deterrent, Radio.....................................3-75
Theft-Deterrent Systems...................................2-13
Content Theft-Deterrent................................2-13
Passlock
®...................................................2-15
Tilt Wheel........................................................ 3-5
Tire Inflation Check.........................................6-10
Tires.............................................................5-56
Buying New Tires........................................5-60
Chains.......................................................5-64
Changing a Flat Tire....................................5-65
If a Tire Goes Flat.......................................5-64
Inflation -- Tire Pressure...............................5-57
Inspection and Rotation................................5-58
Spare Tire..................................................5-82
Uniform Tire Quality Grading.........................5-61
Wheel Alignment and Tire Balance
.................5-62
Wheel Replacement
.....................................5-62
When It Is Time for New Tires
......................5-59
To Use the Engine Coolant Heater
....................2-18
Tonneau Cover
...............................................2-39
Top Strap
......................................................1-39
Top Strap Anchor Location
...............................1-40Torque Lock...................................................2-25
Total Weight on Your Vehicle’s Tires..................4-56
Tow/Haul Mode ...............................................2-21
Tow/Haul Mode Light.......................................3-41
Towing
Recreational Vehicle.....................................4-47
Towing a Trailer..........................................4-53
Your Vehicle...............................................4-46
Traction
Manual Selectable Ride................................. 4-9
TRACTION ACTIVE........................................3-55
Trailer
Recommendations.......................................4-52
Trailer Brakes.................................................4-57
Trailer Wiring Harness.....................................4-61
Transfer Case................................................5-45
Transmission
Fluid, Automatic...........................................5-20
Temperature Gage.......................................3-36
TRANSMISSION HOT.....................................3-55
Transmission Operation, Automatic....................2-19
Transmission, Transaxle, Transfer Case Unit
Repair Manual............................................7-10
Transportation Options...................................... 7-7
Traveling to Remote Areas...............................4-20
Trip Information Button....................................3-43
Trip Odometer
................................................3-26
Truck-Camper Loading Information
....................4-50
Turn and Lane Change Signals
.......................... 3-6
TURN SIGNAL ON
.........................................3-54
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2003 - Sierra Denali