2005 BUICK RANDEZVOUS engine overheat

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 on
page 5-30for 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.
How to Add Coolant to the Coolant
Recovery Tank
If you have not found a problem yet, but the coolant
level is not at or above 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 5-25for 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.
5-32

{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 or
above the full cold mark, start your vehicle.
If the overheat warning continues, there is one more
thing you can try. You can add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before you do it.
{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.
5-33

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.
1. You can remove the radiator pressure cap when
the cooling system, including the radiator pressure
cap and upper radiator hose, is no longer hot.
Turn the pressure cap slowly counterclockwise until
it rst stops. Do not 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.2. Then keep turning the pressure cap, but now push
down as you turn it. Remove the pressure cap.
{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.
HousingBypass Tube
5-34

Door (cont.)
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-10
Driver
Four-Way Manual Seat.................................. 1-3
Position, Safety Belt.....................................1-25
Driver Behavior................................................ 4-2
Driver Information Center (DIC).........................3-62
DIC Controls and Displays............................3-64
DIC Vehicle Personalization..........................3-66
Driving
At Night.....................................................4-17
City...........................................................4-21
Defensive..................................................... 4-3
Drunken....................................................... 4-3
Environment................................................. 4-2
Freeway.....................................................4-22
Hill and Mountain Roads..............................4-24
In Rain and on Wet Roads...........................4-18
Rocking Your Vehicle to Get it Out.................4-31
Winter........................................................4-26
Dual Automatic Climate Control System.............3-33
Dual Climate Control System............................3-30
DVD
Rear Seat Entertainment System..................3-115E
Electrical System
Add-On Equipment.....................................5-104
Floor Console Fuse Block...........................5-105
Fuses and Circuit Breakers.........................5-105
Headlamp Wiring.......................................5-104
Power Windows and Other Power Options.......5-104
Underhood Fuse Block...............................5-107
Windshield Wiper Fuses.............................5-104
Engine
Air Cleaner/Filter.........................................5-21
Battery.......................................................5-41
Change Oil Message...................................3-55
Check and Service Engine Soon Light............3-46
Coolant......................................................5-25
Coolant Heater............................................2-22
Coolant Temperature Gage...........................3-46
Coolant Temperature Warning Message..........3-52
Engine Compartment Overview......................5-12
Exhaust.....................................................2-29
Low Oil Level Message................................3-55
Oil .............................................................5-16
Overheated Protection Operating Mode...........5-30
5

Engine (cont.)
Overheating................................................5-28
Reduced Power Message.............................3-53
Starting......................................................2-21
Entry Lighting.................................................3-17
Event Data Recorders (EDR)............................7-10
Exit Delay, Headlamp......................................3-17
Exit Lighting...................................................3-18
Extender, Safety Belt.......................................1-42
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-21
Finish Damage.............................................5-101
Flash-to-Pass................................................... 3-8
Flat Tire........................................................5-72
Flat Tire, Changing.........................................5-72
Flat Tire, Storing.............................................5-88
Fluid
Automatic Transaxle.....................................5-22
Power Steering...........................................5-36
Windshield Washer......................................5-37
Fog Lamps....................................................3-15
Four-Way Manual Driver Seat............................ 1-3Front Armrest Storage Area..............................2-40
Front Console Storage Area.............................2-39
Front Reading Lamps......................................3-19
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Filling a Portable Fuel Container....................5-10
Filling Your Tank........................................... 5-8
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-50
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Low Warning Message.................................3-58
Fuses
Floor Console Fuse Block...........................5-105
Fuses and Circuit Breakers.........................5-105
Underhood Fuse Block...............................5-107
Windshield Wiper.......................................5-104
G
Gage
Engine Coolant Temperature.........................3-46
Fuel..........................................................3-50
Speedometer..............................................3-39
Tachometer.................................................3-40
6

Message (cont.)
Low Oil Pressure.........................................3-54
Low Tire .....................................................3-56
Low Washer Fluid Warning...........................3-58
Park Lamp Warning.....................................3-61
PASS-Key
®III Security.................................3-57
Program Mode............................................3-60
Rear Hatch Ajar Warning..............................3-56
Reduced Engine Power................................3-53
Remote Keyless Entry Transmitter Battery
Low Warning...........................................3-60
Service Traction System Warning...................3-51
Service Vehicle Soon...................................3-59
Traction Active............................................3-52
Mirrors
Manual Rearview Mirror................................2-31
Outside Convex Mirror.................................2-32
Outside Curb View Assist Mirror....................2-32
Outside Heated Mirrors................................2-32
Outside Power Mirror...................................2-31
MyGMLink.com................................................ 7-3
N
Navigation/Radio System................................3-130
New Vehicle Break-In......................................2-19
Normal Maintenance Replacement Parts............6-13
O
Odometer......................................................3-39
Odometer, Trip...............................................3-39
Off-Road Recovery..........................................4-14
Oil
Engine.......................................................5-16
Pressure Message.......................................3-54
Older Children, Restraints................................1-43
Online Owner Center........................................ 7-3
OnStar
®System.............................................2-33
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-36
Outside
Convex Mirror.............................................2-32
Curb View Assist Mirror................................2-32
Heated Mirrors............................................2-32
Power Mirror...............................................2-31
Overhead Console..........................................2-39
Overheated Engine Protection Operating Mode.....5-30
Owner Checks and Services.............................. 6-8
Owners, Canadian............................................... ii
10