2004 GMC YUKON XL DENALI engine overheat

If No Steam Is Coming From Your
Engine
An overheat warning, along with a low coolant condition,
can indicate a serious problem. For more information
see
Driver Information Center (DIC) on page 3-46.
If you get an engine overheat warning, and don't have a
low coolant condition, 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. SeeTowing a Trailer on page 4-51.
If you get the overheat warning with no sign of steam, try
this for a minute or so:
1. Turn on your heater to full hot at the highest fan
speed and open the window as necessary.
2. If you're in a traffic jam, shift to NEUTRAL (N);
otherwise, shift to the highest gear while
driving ± DRIVE (D).If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about 10 minutes.
If the warning doesn't come back on, you can drive
normally.
If the warning continues, pull over, stop, and park your
vehicle right away.
If there's still no sign of steam, push down the
accelerator until the engine speed is about twice as fast
as normal idle speed for at least three minutes while
you're parked. If you still have the warning,
turn off the
engine and get everyone out of the vehicleuntil it
cools down. Also, see ªOverheated Engine Protection
Operating Modeº listed previously in this section.
You may decide not to lift the hood but to get service
help right away.
5-27

{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. See
ªOverheated Engine Protection Operating Modeº
in the Index for information on driving to a safe
place in an emergency.
Notice:Using coolant other than DEX-COOLžmay
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
ž(silicate-free) coolant in your vehicle.
5-29

{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
žcoolant.
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.
1. Park the vehicle on a
level surface.
You can remove the coolant surge tank pressure cap
when the cooling system, including the coolant
surge tank pressure cap and upper radiator hose, is no
longer hot.
Turn the pressure cap slowly counterclockwise (left)
about one full turn. If you hear a hiss, wait for that
to stop. A hiss means there is still some pressure left.
5-31

Door (cont.)
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-12
Driver
Position, Safety Belt.....................................1-30
DRIVER DOOR AJAR.....................................3-58
Driver Information Center (DIC).........................3-46
DIC Operation and Displays..........................3-46
DIC Warnings and Messages........................3-57
Driving
At Night.....................................................4-28
City...........................................................4-32
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Freeway.....................................................4-33
Hill and Mountain Roads..............................4-35
In Rain and on Wet Roads...........................4-29
Winter........................................................4-37
Driving Across an Incline..................................4-24
Driving Downhill..............................................4-23
Driving in Mud, Sand, Snow or Ice....................4-26
Driving in Water..............................................4-27
Driving On Grades..........................................4-60
Driving on Off-Road Hills.................................4-20
Driving on Snow or Ice....................................4-38
Driving Through Deep Standing Water...............4-31
Driving Through Flowing Water.........................4-31
Driving Uphill..................................................4-21
Driving with a Trailer.......................................4-58
Dual Automatic Climate Control System.............3-20DVD
Cleaning the Video Screen...........................3-99
Distortion....................................................3-97
Rear Seat Entertainment System...................3-80
DVD Player....................................................3-80
E
Easy Exit Seat...............................................2-50
Electrical System
Add-On Equipment.....................................5-103
Fuses and Circuit Breakers.........................5-103
Power Windows and Other Power Options....5-103
Windshield Wiper Fuses.............................5-103
Emissions Inspection and Maintenance
Programs...................................................3-42
Engine
Air Cleaner/Filter.........................................5-18
Battery.......................................................5-39
Check and Service Engine Soon Light............3-40
Coolant......................................................5-23
Coolant Heater............................................2-21
Coolant Temperature Gage...........................3-38
Engine Compartment Overview......................5-12
Exhaust.....................................................2-30
Fan Noise..................................................5-33
Oil .............................................................5-13
Overheating................................................5-25
Starting......................................................2-19
5

ENGINE COOLANT HOT.................................3-59
Engine Oil Additives........................................5-16
ENGINE OVERHEATED..................................3-59
Entering or Exiting the Third Row Seats.............. 1-7
Entertainment System
Cleaning the Video Screen...........................3-99
DVD Distortion............................................3-97
Entry Lighting.................................................3-17
Environmental Concerns..................................4-17
Erasing HomeLink
žButtons..............................2-42
Event Data Records (EDR)................................ 7-9
Exit Lighting...................................................3-17
Express-Down Windows...................................2-15
Extender, Safety Belt.......................................1-47
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-18
Finding a Program Type (PTY) Station
(RDS and XMŸ).........................................3-70
Finding a Station............................................3-67
Finish Care....................................................5-96
Finish Damage...............................................5-99
Fixed Mast Antenna........................................3-99
Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-73
Flat Tire, Changing.........................................5-74Fluid
Automatic Transmission................................5-20
Power Steering...........................................5-34
Windshield Washer......................................5-35
FM Stereo.....................................................3-97
Fog Lamps....................................................3-16
Folding the Seatback.......................................1-17
Folding the Seatbacks.............................1-12, 1-22
Folding the Seatbacks (60/40 Split Bench Seat)....... 1-9
Following Distance..........................................4-59
Front Axle......................................................5-47
Frontal Air Bags.............................................1-77
Fuel............................................................... 5-4
Additives...................................................... 5-6
California Fuel.............................................. 5-5
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-45
Gasoline Octane........................................... 5-4
Gasoline Speci®cations.................................. 5-5
Low Warning Light.......................................3-45
Fuel Information Button....................................3-49
FUEL LEVEL LOW.........................................3-59
Fuses
Fuses and Circuit Breakers.........................5-103
Windshield Wiper.......................................5-103
6

O
Odometer......................................................3-32
Off-Road Recovery..........................................4-13
Oil
Engine.......................................................5-13
Pressure Gage............................................3-43
OIL LIFE RESET............................................3-59
OIL PRESSURE LOW.....................................3-60
Older Children, Restraints................................1-48
Online Owner Center........................................ 7-3
OnStar
žPersonal Calling.................................2-38
OnStaržServices............................................2-38
OnStaržSteering Wheel Controls......................2-39
OnStaržSystem.............................................2-37
OnStaržVirtual Advisor....................................2-38
Operating Your All-Wheel-Drive Vehicle Off
Paved Roads..............................................4-16
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-26
Outside
Automatic Dimming Mirror with Curb View
Assist.....................................................2-37
Convex Mirror.............................................2-36
Heated Mirrors............................................2-36
Power Mirrors.............................................2-35
Overheated Engine Protection Operating Mode.....5-25
Owner Checks and Services.............................. 6-9
Owners, Canadian............................................... ii
Owner's Information........................................7-12
P
Park (P)
Shifting Out of............................................2-29
Parking
Brake........................................................2-26
Over Things That Burn.................................2-30
Parking on Hills..............................................4-60
Park(P)
Shifting Into................................................2-27
Passenger Air Bag Indicator.............................2-34
Passenger Air Bag Status Indicator...................3-34
PASSENGER DOOR AJAR..............................3-60
Passenger Sensing System..............................1-81
Passing.................................................4-13, 4-59
Passlock
ž......................................................2-18
Weight of the Trailer........................................4-54
Personalization Button.....................................3-50
Personalization, Climate Controls......................3-29
Plan Ahead When Possible................................ 7-7
Playing a Cassette Tape..................................3-75
Playing a CD.................................................3-77
Playing the Radio...........................................3-66
Power
Accessory Outlets........................................3-18
Door Locks.................................................. 2-9
Electrical System.......................................5-103
Lumbar Controls........................................... 1-4
Seat............................................................ 1-3
Steering Fluid.............................................5-34
10