2003 CADILLAC ESCALADE EXT engine overheat

Coolant Surge Tank Pressure Cap
The coolant surge tank pressure cap must be fully
installed on the coolant surge tank.
Notice:Your pressure cap is a pressure-type cap
and must be tightly installed to prevent coolant loss
and possible engine damage from overheating.
See ªCapacities and Speci®cationsº for more
information.
Engine Overheating
You will ®nd a coolant temperature gage on your
vehicle's instrument panel cluster. SeeEngine Coolant
Temperature Gage on page 3-40. In addition, you
will ®nd a LOW COOLANT, ENGINE COOLANT HOT,
ENGINE OVERHEATED and a REDUCED ENGINE
POWER message in the DIC on the instrument panel.
See
Driver Information Center (DIC) on page 3-47.
Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and the
REDUCED ENGINE POWER message is displayed,
an overheat protection mode which alternates ®ring
groups of cylinders helps prevent engine damage.
In this mode, you will notice a loss in power and engine
performance. This operating mode allows your vehicle
to be driven to a safe place in an emergency. Driving
extended miles (km) and/or towing a trailer in the
overheat protection mode should be avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any
repair. The engine oil will be severely degraded.
Repair the cause of coolant loss and change the oil.
See ªEngine Oilº in the Index.
5-27

If Steam Is Coming From Your Engine
{CAUTION:
Steam from an overheated engine can burn
you badly, even if you just open the hood.
Stay away from the engine if you see or hear
steam coming from it. Just turn it off and get
CAUTION: (Continued)
CAUTION: (Continued)
everyone away from the vehicle until it cools
down. Wait until there is no sign of steam
or coolant before you open the hood.
If you keep driving when your engine is
overheated, the liquids in it can catch ®re.
You or others could be badly burned. Stop
your engine if it overheats, and get out of the
vehicle until the engine is cool.
See ªOverheated Engine Protection Operating
Modeº in the Index for information on driving
to a safe place in an emergency.
Notice:If your engine catches ®re because you
keep driving with no coolant, your vehicle can
be badly damaged. The costly repairs would not
be covered by your warranty. See ªOverheated
Engine Protection Operating Modeº in the Index
for information on driving to a safe place in an
emergency.
5-28

If No Steam Is Coming From Your
Engine
An overheat warning, along with a low coolant message,
can indicate a serious problem. SeeLow CoolantunderDIC Warnings and Messages on page 3-58.
If you get an engine overheat warning with no low
coolant message, 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. See ªDriving on Gradesº under
Towing a Trailer on page 4-52.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.
5-29

{CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Don't touch them.
If you do, you can be burned.
Don't 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 isn't 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:When adding coolant, it is important that
you use only DEX-COOLž(silicate-free) coolant.
If coolant other than DEX-COOLžis added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the engine
coolant will require change sooner Ð at 30,000 miles
(50 000 km) or 24 months, whichever occurs ®rst.
Damage caused by the use of coolant other
than DEX-COOL
žis not covered by your new
vehicle warranty.
5-31

{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 wouldn't 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. Don't spill coolant on a hot engine.
5-33

E
Easy Exit Seat...............................................2-73
Electrical System...........................................5-101
Add-On Equipment.....................................5-101
Fuses and Circuit Breakers.........................5-101
Power Windows and Other Power Options.......5-101
Windshield Wiper Fuses.............................5-101
Electrochromic Mirror Operation........................2-42
Emissions Inspection and
Maintenance Programs.................................3-44
ENGINE COOLANT HOT.................................3-59
Engine Coolant Level Check.............................6-11
Engine Oil Additives........................................5-17
Engine Oil and Chassis Lubrication Scheduled
Maintenance................................................. 6-5
Engine Oil Level Check...................................6-11
ENGINE OVERHEATED..................................3-60
Engine..........................................................5-19
Air Cleaner/Filter.........................................5-19
Battery.......................................................5-43
Check and Service Engine Soon Light............3-42
Compartment Overview................................5-12
Coolant Heater............................................2-31
Coolant Temperature Gage...........................3-40
Coolant......................................................5-24
Cooling System Inspection............................6-16
Exhaust.....................................................2-39Engine (cont.)
Fan Noise..................................................5-36
Oil .............................................................5-14
Overheating................................................5-27
Starting......................................................2-29
Entertainment System....................................3-101
Cleaning the Video Screen..........................3-101
DVD Distortion............................................3-99
Entry Lighting.................................................3-18
Environmental Concerns..................................4-20
Erasing HomeLink
žButtons..............................2-51
Exit Lighting...................................................3-18
Extender, Safety Belt.......................................1-27
Exterior Lamps...............................................3-14
F
Filter.............................................................5-19
Engine Air Cleaner......................................5-19
Finding a PTY Station (RDS and XMŸ).............3-71
Finding a Station............................................3-69
Finish Care....................................................5-96
Finish Damage...............................................5-98
Fixed Mast Antenna.......................................3-101
Flash-to-Pass................................................... 3-9
Flat Tire, Changing.........................................5-76
Flat Tire........................................................5-75
6

Mirrors..........................................................2-41
Automatic Dimming Rearview with OnStarž,
Compass and Temperature Display.............2-41
Outside Automatic Dimming Mirror with
Curb View Assist......................................2-45
Outside Convex Mirror.................................2-44
Outside Heated Mirrors................................2-45
Outside Power Mirrors..................................2-44
MyGMLink.com................................................ 7-3
N
Navigation/Radio System..................................3-93
New Vehicle Break-In......................................2-28
Normal Maintenance Replacement Parts...........5-111
O
Odometer......................................................3-33
Off-Road Recovery..........................................4-15
OIL LIFE RESET............................................3-59
OIL PRESSURE LOW.....................................3-59
Oil ................................................................5-14
Engine.......................................................5-14
Pressure Gage............................................3-44
Older Children, Restraints................................1-28
Online Owner Center........................................ 7-3OnStar
žPersonal Calling.................................2-47
OnStaržServices............................................2-46
OnStaržSteering Wheel Controls......................2-47
OnStaržSystem.............................................2-46
OnStaržVirtual Advisor....................................2-47
Operating Your All-Wheel-Drive Vehicle
Off Paved Roads.........................................4-18
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-30
Outside.........................................................2-45
Automatic Dimming Mirror with
Curb View Assist......................................2-45
Convex Mirror.............................................2-44
Heated Mirrors............................................2-45
Power Mirrors.............................................2-44
Overheated Engine Protection Operating Mode.....5-27
Overseas ± Customer Assistance........................ 7-5
Owners, Canadian............................................... ii
Owner's Information........................................7-11
P
Park Aid........................................................3-20
Park (P)........................................................2-38
Shifting Out of............................................2-38
Parking Brake and Automatic Transmission
Park (P) Mechanism Check...........................6-14
Parking on Hills..............................................4-59
11