2004 BUICK REGAL engine overheat

If it is not, there may be 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, the 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.
5-33

How to Add Coolant to the Coolant
Recovery Tank
If no problem has been found yet, but the coolant level
is not at the COLD mark, add a 50/50 mixture of
clean, drinkable water and DEX-COOL
®engine coolant
at the coolant recovery tank. SeeEngine Coolant on
page 5-26for more information.
{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.
When the coolant in the coolant recovery tank is at the
COLD mark, start the vehicle.
5-34

If the overheated warnings continue, there is one more
thing that can be done. Add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before this is done.
{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 radiator
pressure cap — even a little — they can come
out at high speed. Never turn the cap when the
cooling system, including the radiator pressure
cap, is hot. Wait for the cooling system and
radiator pressure cap to cool if you ever have
to turn the pressure cap.
How to Add Coolant to the Radiator
Notice:Your engine has a specic radiator
ll procedure. Failure to follow this procedure could
cause your engine to overheat and be severely
damaged.
Turn the pressure cap slowly counterclockwise until the
rst stop. Do not press down while turning the
pressure cap.
5-35

E
Electrical System
Add-On Equipment......................................5-97
Fuses and Circuit Breakers...........................5-98
Headlamp Wiring.........................................5-98
Power Windows and Other Power Options......5-98
Windshield Wiper Fuses...............................5-98
Emergency Trunk Release Handle.....................2-13
Emissions Inspection and Maintenance
Programs...................................................3-37
Engine
Air Cleaner/Filter.........................................5-22
Battery.......................................................5-46
Change Engine Oil Light...............................3-39
Check and Service Engine Soon Light............3-35
Coolant......................................................5-26
Coolant Heater............................................2-20
Coolant Temperature Gage...........................3-34
Coolant Temperature Warning Light................3-34
Drive Belt Routing.......................................6-14
Engine Compartment Overview......................5-12
Exhaust.....................................................2-29
Oil .............................................................5-16
Overheating................................................5-29
Starting......................................................2-19
Supercharger Oil.........................................5-21Engine Cooling When Trailer Towing..................4-45
Engine Oil Additives........................................5-19
Entry Lighting.................................................3-14
Event Data Records (EDR)................................ 7-9
Express-Down Window....................................2-15
Extender, Safety Belt.......................................1-26
Exterior Lamps...............................................3-11
F
Filter
Engine Air Cleaner......................................5-22
Finding a Program Type (PTY) Station.......3-48, 3-55
Finding a Station....................................3-46, 3-53
Finish Care....................................................5-93
Finish Damage...............................................5-95
Flash-to-Pass................................................... 3-7
Flat Tire........................................................5-77
Flat Tire, Changing.........................................5-78
Fluid
Automatic Transaxle.....................................5-24
Power Steering...........................................5-40
Windshield Washer......................................5-42
FM ...............................................................3-62
Fog Lamps....................................................3-13
5

Matching Transmitter(s) to Your Vehicle............... 2-7
Mexico, Central America and Caribbean
Islands/Countries (Except Puerto Rico and
U.S. Virgin Islands) – Customer Assistance....... 7-5
Mirrors
Automatic Dimming Rearview........................2-32
Automatic Dimming Rearview with OnStar
®.....2-32
Manual Rearview Mirror................................2-31
Manual Rearview Mirror with OnStar
®.............2-31
Outside Convex Mirror.................................2-33
Outside Power Foldaway Mirrors....................2-33
Modes...........................................................3-44
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-17
Normal Maintenance Replacement Parts............6-13
O
Odometer......................................................3-28
Off-Road Recovery..........................................4-14
Oil
Change Engine Oil Light...............................3-39
Engine.......................................................5-16
Low Oil Level Light......................................3-39Oil (cont.)
Pressure Light.............................................3-38
Supercharger, Engine...................................5-21
Older Children, Restraints................................1-27
Online Owner Center........................................ 7-3
OnStar
®Personal Calling.................................2-35
OnStar®Services............................................2-34
OnStar®System.............................................2-34
OnStar®Virtual Advisor....................................2-35
Operation Tips................................................3-25
Other Warning Devices...................................... 3-4
Outlet Adjustment............................................3-24
Outside
Convex Mirror.............................................2-33
Power Foldaway Mirrors...............................2-33
Overheated Engine Protection
Operating Mode..........................................5-29
Overseas – Customer Assistance........................ 7-5
Owner Checks and Services.............................. 6-8
Owners, Canadian............................................... ii
Owner’s Information........................................7-12
P
Park (P)
Shifting Into................................................2-27
Shifting Out of............................................2-27
9