2005 CHEVROLET UPLANDER engine overheat

Overheated Engine Protection
Operating Mode
This emergency operating mode allows your vehicle to
be driven to a safe place in an emergency situation.
If an overheated engine condition exists, an overheat
protection mode which alternates ring groups of
cylinders helps prevent engine damage. In this mode,
you will notice a signicant loss in power and engine
performance. The temperature gage will indicate
an overheat condition exists. Driving extended
miles (km) and/or towing a trailer in the overheat
protection mode should be avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any
repair. The engine oil will be severely degraded.
Repair the cause of coolant loss, change the oil and
reset the oil life system. SeeEngine Oil on
page 5-13.
Cooling System
When you decide it is safe to lift the hood, here is what
you will see:
A. Radiator Pressure Cap
B. Electric Engine Cooling Fans
C. Coolant Recovery Tank
5-27

{CAUTION:
An electric engine cooling fan under the hood
can start up even when the engine is not
running and can injure you. Keep hands,
clothing and tools away from any underhood
electric fan.
If the coolant inside the coolant recovery tank is boiling,
do not do anything else until it cools down. The
vehicle should be parked on a level surface.
The coolant level should be at or above the full cold
mark. If it is not, 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.
5-28

Notice:Engine damage from running your engine
without coolant is not covered by your warranty. See
Overheated Engine Protection Operating Mode on
page 5-27for 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 of clean, drinkable water and DEX-COOL
®
engine coolant at the coolant recovery tank. See
Engine Coolant on page 5-22for 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.
5-29

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.
When the coolant in the coolant recovery tank is at or
above the full cold mark, start your vehicle.
{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.
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.
5-30

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.
5-31

Electrical System
Add-On Electrical Equipment
Notice:Don’t add anything electrical to your
vehicle unless you check with your dealer rst.
Some electrical equipment can damage your vehicle
and the damage wouldn’t be covered by your
warranty. Some add-on electrical equipment can
keep other components from working as they
should.
Your vehicle has an airbag system. Before attempting to
add anything electrical to your vehicle, seeServicing
Your Airbag-Equipped Vehicle on page 1-85.
Headlamp Wiring
The headlamp wiring is protected by four internal fuses
in the underhood fuse block. An electrical overload
will cause the lamps to go on and off, or in some cases
to remain off. If this happens, have your headlamp
wiring checked right away.
Windshield Wiper Fuses
The windshield wiper motor is protected by an internal
fuse in the underhood fuse block. If the motor overheats
due to heavy snow, etc., the wiper will stop until the
motor cools. If the overload is caused by some electrical
problem, be sure to get it xed.
The rear washer pump is controlled by a relay located
in the engine compartment, behind the windshield
washer uid reservoir. The rear wiper motor is protected
by a fuse located in the instrument panel fuse block.
Power Windows and Other
Power Options
Circuit breakers in the instrument panel fuse panel
protect the power windows and other power accessories.
When the current load is too heavy, the circuit breaker
opens and closes, protecting the circuit until the
problem is xed.
5-95

E
Electrical System
Add-On Equipment......................................5-95
Fuses and Circuit Breakers...........................5-96
Headlamp Wiring.........................................5-95
Instrument Panel Fuse Block.........................5-96
Power Windows and Other Power Options......5-95
Underhood Fuse Block.................................5-98
Windshield Wiper Fuses...............................5-95
Engine
Air Cleaner/Filter.........................................5-18
Battery.......................................................5-39
Check and Service Engine Soon Light............3-40
Coolant......................................................5-22
Coolant Heater............................................2-34
Coolant Temperature Gage...........................3-39
Engine Compartment Overview......................5-12
Exhaust.....................................................2-41
Oil .............................................................5-13
Oil Life System...........................................5-16
Overheated Protection Operating Mode...........5-27
Overheating................................................5-25
Starting......................................................2-33
Entry Lighting.................................................3-18
Event Data Recorders (EDR)............................. 7-9
Exit Lighting...................................................3-19
Extender, Safety Belt.......................................1-42
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-18
Finish Damage...............................................5-92
Fixed Mast Antenna.......................................3-114
Flash-to-Pass................................................... 3-8
Flat Tire........................................................5-67
Flat Tire, Changing.........................................5-68
Flat Tire, Storing.............................................5-80
Flip and Fold Rear Seats.................................. 1-8
Fluid
Automatic Transaxle.....................................5-19
Power Steering...........................................5-34
Windshield Washer......................................5-35
Folding Tray...................................................2-53
Front Console Storage Area.............................2-53
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.........................................................3-44
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Low Warning Light.......................................3-44
5

N
New Vehicle Break-In......................................2-31
Normal Maintenance Replacement Parts............6-13
O
Odometer......................................................3-33
Odometer, Trip...............................................3-33
Off-Road Recovery..........................................4-15
Oil
Engine.......................................................5-13
Pressure Light.............................................3-42
Oil, Engine Oil Life System..............................5-16
Older Children, Restraints................................1-42
Online Owner Center........................................ 7-3
OnStar
®System, see OnStar®Manual...............2-44
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-28
Outside
Convex Mirror.............................................2-44
Heated Mirrors............................................2-44
Power Mirrors.............................................2-43
Overhead Console..................................2-51, 2-53
Overhead Console Switchbank..........................3-20
Overheated Engine Protection Operating Mode.....5-27
Owner Checks and Services.............................. 6-8
Owners, Canadian............................................... ii
P
Park Aid........................................................3-21
Park (P)
Shifting Into................................................2-39
Shifting Out of............................................2-40
Parking
Assist........................................................3-21
Brake........................................................2-38
Over Things That Burn.................................2-41
Passenger Airbag Status Indicator.....................3-35
Passenger Sensing System..............................1-80
Passing.........................................................4-15
PASS-Key
®III ................................................2-29
PASS-Key®III Operation..................................2-30
Power
Accessory Outlets........................................3-23
Door Locks.................................................2-12
Electrical System.........................................5-95
Outlet 115 Volt Alternating Current.................3-24
Rear Quarter Windows.................................2-26
Retained Accessory (RAP)............................2-32
Six-Way Seats.............................................. 1-4
Sliding Door................................................2-17
Steering Fluid.............................................5-34
Windows....................................................2-25
Pretensioners, Safety Belt................................1-41
Programmable Automatic Door Unlock...............2-14
9