2004 CADILLAC DEVILLE engine overheat

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 3-65.
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 does not come back on, you can drive
normally.
If the warning continues, pull over, stop, and park your
vehicle right away.
If there is still no sign of steam, idle the engine for three
minutes while you are parked. If you still have the
warning,turn off the engine and get everyone out of the
vehicleuntil it cools down. Also, see “Overheated
Engine Protection Operating Mode” listed previously in
this section.
You may decide not to lift the hood but to get service
help right away.
5-33

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. 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, 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 are not, your vehicle needs service.
Notice:Engine damage from running your engine
without coolant is not 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: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.
5-35

{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.
5-37

Engine
Air Cleaner/Filter.........................................5-22
Battery.......................................................5-46
Check and Service Engine Soon Light............3-55
Coolant......................................................5-27
Coolant Heater............................................2-27
Coolant Temperature Gage...........................3-54
Coolant Temperature Warning Light................3-54
Drive Belt Routing.......................................6-15
Engine Compartment Overview......................5-14
Exhaust.....................................................2-37
Oil .............................................................5-15
Overheating................................................5-31
Starting......................................................2-26
Engine Cooling When Trailer Towing..................4-48
Engine Oil Additives........................................5-20
Engine Speed Limiter......................................3-49
English/Metric Button.......................................3-48
Entering Feature Programming..........................3-74
Entry Lighting.................................................3-23
Erasing HomeLink
®Buttons..............................2-49
Event Data Recorders (EDR)............................7-10
Exiting Feature Programming............................3-88
Express-Down Window....................................2-16
Express-Up Window........................................2-16Extender, Safety Belt.......................................1-28
Exterior Lamps...............................................3-17
Exterior Lighting Battery Saver..........................3-22
Exterior Lights at Unlock..................................3-82
F
Filter
Engine Air Cleaner......................................5-22
Finding a Program Type (PTY) Station
(XM™ Only)......................................3-93, 3-101
Finding a Station....................................3-91, 3-99
Finish Care..................................................5-102
Finish Damage.............................................5-104
Flash-To-Pass................................................3-10
Flat Tire........................................................5-85
Flat Tire, Changing.........................................5-86
Floor Mats.....................................................2-53
Fluid
Automatic Transaxle.....................................5-24
Power Steering...........................................5-40
Windshield Washer......................................5-41
FM Stereo....................................................3-115
Fog Lamp Light..............................................3-59
Fog Lamps....................................................3-20
6

O
Odometer......................................................3-47
Odometer, Trip...............................................3-47
Off-Road Recovery..........................................4-14
Oil
Engine.......................................................5-15
Life Indicator...............................................3-89
Pressure Light.............................................3-58
Older Children, Restraints................................1-29
Online Owner Center........................................ 7-4
OnStar
®Personal Calling.................................2-44
OnStar®Services............................................2-44
OnStar®Steering Wheel Controls......................2-45
OnStar®System.............................................2-43
OnStar®Virtual Advisor....................................2-44
Other Warning Devices...................................... 3-7
Outlet Adjustment............................................3-37
Outside
Automatic Dimming Mirror.............................2-42
Convex Mirror.............................................2-43
Curb View Assist Mirror................................2-42
Heated Mirrors............................................2-43
Power Mirrors.............................................2-41
Overheated Engine Protection Operating Mode.....5-31
Overseas – Customer Assistance........................ 7-5
Owner Checks and Services.............................. 6-9
Owners, Canadian............................................... ii
Owner’s Information........................................7-13
P
Parade Dimming.............................................3-23
Park Aid........................................................3-28
Park (P)
Shifting Into................................................2-33
Shifting Out of............................................2-36
Parking
Assist........................................................3-28
Brake........................................................2-32
Brake Indicator Light....................................3-51
Over Things That Burn.................................2-37
Parking on Hills..............................................4-47
Passenger Compartment Air Filter.....................3-40
Passing.................................................4-14, 4-46
PASS-Key
®III ................................................2-21
PASS-Key®III Operation..................................2-22
Performance Shifting (DTS Only).......................2-32
Personalization, Climate Controls......................3-43
Plan Ahead When Possible................................ 7-8
Playing a Cassette Tape................................3-106
Playing a CD........................................3-96, 3-108
Playing the Radio...................................3-91, 3-99
Power
Accessory Outlets........................................3-30
Door Locks.................................................. 2-9
Electrical System.......................................5-107
Lumbar Controls........................................... 1-2
11