2003 CADILLAC DEVILLE engine overheat

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. SeeDIC Warnings
and Messages on page 3-60.
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.
If you get the overheat warning with no sign of steam,
try this for a minute or so:
1. In heavy traffic, let the engine idle in NEUTRAL (N)
while stopped. If it safe to do so, pull of the road,
shift to PARK (P) or NEUTRAL (N) and let the
engine idle.
2. Set the temperature control to the highest heat
setting and open the windows, as necessary.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, idle the engine for 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

A low coolant level should be indicated by a CHECK
COOLANT LEVEL message on the Driver Information
Center. If it is, 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. 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, with the engine on, check
to see if the electric engine cooling fans are running.
If the engine is overheating, both fans should be
running. If they aren't, your vehicle needs service.
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.
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 the proper level 4.5 inches
(11.4 cm) below the top of the ®ller neck), add a
50/50 of
clean, drinkable waterand DEX-COOLžcoolant
at the coolant surge tank, but be sure the cooling
system, including the coolant surge tank pressure cap,
is cool before you do it. See
Engine Coolant on
page 5-24for more information.
5-31

CAUTION: (Continued)
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.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) until it ®rst stops. (Don't
press down while turning the pressure cap.)
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
5-33

Engine (cont.)
Coolant......................................................5-24
Cooling System Inspection............................6-14
Exhaust.....................................................2-38
Oil .............................................................5-13
Overheating................................................5-27
Starting......................................................2-25
English/Metric Button.......................................3-44
Entering Feature Programming..........................3-67
Entry Lighting.................................................3-20
Erasing HomeLink
žButtons..............................2-50
Exiting Feature Programming............................3-78
Express-Down Window....................................2-16
Express-Up Window........................................2-16
Extender, Safety Belt.......................................1-28
Exterior Lamps...............................................3-15
Exterior Lighting Battery Saver..........................3-19
Exterior Lights at Unlock..................................3-72
F
Filter.............................................................5-19
Engine Air Cleaner......................................5-19
Finding a PTY Station (RDS and XMŸ).............3-94
Finding a PTY Station (XMŸ Only)...................3-83
Finding a Station....................................3-82, 3-90
Finish Care....................................................5-88Finish Damage...............................................5-90
Flash-To-Pass.................................................. 3-9
Flat Tire, Changing.........................................5-72
Flat Tire........................................................5-71
Floor Mats.....................................................2-53
Fluid.............................................................5-21
Automatic Transaxle.....................................5-21
Power Steering...........................................5-36
Windshield Washer......................................5-37
FM Stereo....................................................3-105
Fog Lamp Light..............................................3-54
Fog Lamps....................................................3-17
Following Distance..........................................4-38
Footnotes........................................................ 6-5
Front Ashtray.................................................3-28
Front Storage Area.........................................2-51
Fuel............................................................... 5-4
Additives...................................................... 5-6
California Fuel.............................................. 5-5
Data Display...............................................3-56
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-6
Gage.........................................................3-55
Gasoline Octane........................................... 5-4
Gasoline Speci®cations.................................. 5-5
System Inspection.......................................6-13
6

N
Navigation/Radio System................................3-100
New Vehicle Break-In......................................2-23
Night Vision System........................................3-22
Normal Maintenance Replacement Parts...........5-103
O
Odometer, Trip...............................................3-43
Odometer......................................................3-43
Off-Road Recovery..........................................4-13
Oil ................................................................5-13
Engine.......................................................5-13
Life Indicator...............................................3-79
Pressure Light.............................................3-53
Older Children, Restraints................................1-29
Online Owner Center........................................ 7-4
OnStar
žPersonal Calling.................................2-45
OnStaržServices............................................2-45
OnStaržSteering Wheel Controls......................2-46
OnStaržSystem.............................................2-45
OnStaržVirtual Advisor....................................2-46
Other Warning Devices...................................... 3-7
Outlet Adjustment............................................3-33
Outside.........................................................2-43
Automatic Dimming Mirror.............................2-43
Convex Mirror.............................................2-44Outside (cont.)
Curb View Assist Mirror................................2-43
Heated Mirrors............................................2-44
Power Mirrors.............................................2-42
Overheated Engine Protection Operating Mode . . . 5-27
Overseas ± Customer Assistance........................ 7-5
Owners, Canadian............................................... ii
Owner's Information........................................7-12
P
Parade Dimming.............................................3-20
Park Aid........................................................3-25
Park (P)........................................................2-37
Shifting Out of............................................2-37
Parking Brake and Automatic Transaxle Park (P)
Mechanism Check.......................................6-12
Parking on Hills..............................................4-39
Parking.........................................................3-25
Assist........................................................3-25
Brake Indicator Light....................................3-47
Brake........................................................2-32
Over Things That Burn.................................2-38
Park(P).........................................................2-34
Shifting Into................................................2-34
Part A - Scheduled Maintenance Services............ 6-4
Part B - Owner Checks and Services.................. 6-9
Part C - Periodic MaintenanceInspections..........6-13
11