2007 BUICK LUCERNE engine overheat

How to Add Coolant to the Coolant
Recovery Tank
{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.
If you have not found a problem yet, but the
coolant level is not at the FULL COLD mark, add
a 50/50 mixture ofclean, drinkable waterand
DEX-COOL
®engine coolant at the coolant
recovery tank. SeeEngine Coolant on page 347
for more information.
{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 FULL COLD mark, start your vehicle.
356

If the coolant inside the coolant surge tank is
boiling, do not do anything else until it cools down.
The vehicle should be parked on a level surface.
{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. SeeOverheated Engine Protection
Operating Mode on page 353for 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 could 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.
How to Add Coolant to the Coolant
Surge Tank
If you have not found a problem yet, check to see
if coolant is visible in the surge tank. If coolant
is visible but the level is not at the FULL COLD
mark located on the side of the surge tank,
add enough of a 50/50 mixture of clean, drinkable
water and DEX-COOL
®coolant at the coolant
surge tank to bring the level to the FULL COLD
mark, but be sure the cooling system, including the
coolant surge tank pressure cap (if equipped), is
cool before you do it. SeeEngine Coolant on
page 347for more information.
361

If no coolant is visible in the surge tank, add
coolant as follows:
{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 coolant surge tank pressure
cap — even a little — they can come out at
high speed. Never turn the cap when the
cooling system, including the coolant
surge tank pressure cap, is hot. Wait for
the cooling system and coolant surge
tank pressure cap to cool if you ever have
to turn the pressure cap.
{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.
362

Engine (cont.)
Overheated Protection Operating Mode...... 353
Overheating............................................. 351
Starting.................................................... 116
Entry Lighting.............................................. 174
Event Data Recorders (EDR)...................... 471
Extender, Safety Belt..................................... 42
Exterior Lamps............................................ 170
Exterior Lighting Battery Saver.................... 173
F
Filter
Engine Air Cleaner................................... 342
Finish Damage............................................ 425
Flashers, Hazard Warning........................... 160
Flash-to-Pass.............................................. 164
Flat Tire...................................................... 407
Flat Tire, Changing...................................... 408
Flat Tire, Storing......................................... 416Fluid
Automatic Transaxle................................. 343
Power Steering........................................ 364
Windshield Washer.................................. 365
Fog Lamp Light........................................... 210
Fog Lamps.................................................. 173
Front Reading Lamps.................................. 175
Front Storage Area...................................... 151
Fuel............................................................ 327
Additives.................................................. 328
California Fuel.......................................... 328
Filling a Portable Fuel Container.............. 332
Filling Your Tank...................................... 330
Fuels in Foreign Countries....................... 329
Gage....................................................... 211
Gasoline Octane...................................... 327
Gasoline Specications............................ 328
Fuses
Fuses and Circuit Breakers...................... 428
Rear Underseat Fuse Block..................... 431
Underhood Fuse Block............................. 428
486

Outlet Adjustment........................................ 192
Outlet(s), Accessory Power.......................... 181
Outside
Automatic Dimming Heated Mirror............ 135
Convex Mirror.......................................... 134
Curb View Assist Mirror........................... 134
Power Mirrors.......................................... 133
Overheated Engine Protection
Operating Mode....................................... 353
Owner Checks and Services....................... 448
Owners, Canadian.......................................... 3
P
Paint, Damage............................................ 425
Panic Brake Assist...................................... 285
Park Aid...................................................... 178
Park (P)
Shifting Into............................................. 123
Shifting Out of......................................... 125
Parking
Assist....................................................... 178
Brake....................................................... 122
Over Things That Burn............................ 126Passenger Airbag Status Indicator............... 198
Passenger Compartment Air Filter............... 192
Passenger Sensing System........................... 81
Passing....................................................... 288
PASS-Key
®III+........................................... 111
PASS-Key®III+ Operation........................... 112
Perimeter Lighting....................................... 175
Power
Accessory Outlet(s).................................. 181
Door Locks.............................................. 103
Electrical System..................................... 428
Inadvertent Battery Saver......................... 177
Lumbar Controls........................................ 10
Retained Accessory (RAP)....................... 115
Seat............................................................ 9
Steering Fluid.......................................... 364
Windows.................................................. 109
Pretensioners, Safety Belt............................. 42
Programmable Automatic Door Locks.......... 104
Q
Questions and Answers About Safety Belts...... 24
491