engine overheat CHEVROLET CORVETTE 2009 6.G User Guide

Checking Coolant
1. Verify that the engine and intercooler are no
longer hot.
2. Place a cloth to absorb possible coolant loss under
the driver’s side bleeder valve (A).3. Loosen, but do not completely unscrew the bleeder
valve to check for coolant in the system.
4. Tighten the bleeder valve if there is coolant owing
out of the bleeder valve.
5. If there is no coolant owing out of the bleeder
valve, there could be a leak in the system.
Tighten the bleeder valve and contact your
dealer/retailer for service.
Engine Coolant
The cooling system in the vehicle is lled with
DEX-COOL®engine coolant. This coolant is designed
to remain in the vehicle for ve years or 150,000 miles
(240 000 km), whichever occurs rst.
The following explains the cooling system and how to
check and add coolant when it is low. If there is a problem
with engine overheating, seeEngine Overheating on
page 5-39.
5-34

What to Use
{CAUTION:
Adding only plain water to the cooling system can
be dangerous. Plain water, or some other liquid
such as alcohol, can boil before the proper coolant
mixture will. The vehicle’s coolant warning system
is set for the proper coolant mixture. With plain
water or the wrong mixture, the engine could get
too hot but would not get the overheat warning.
The engine could catch re and you or others
could be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
®coolant.Use a 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant. If using this mixture, nothing
else needs to be added. This mixture:
Gives freezing protection down to−34°F (−37°C),
outside temperature.
Gives boiling protection up to 265°F (129°C),
engine temperature.
Protects against rust and corrosion.
Will not damage aluminum parts.
Helps keep the proper engine temperature.
Notice:If an improper coolant mixture is used,
the engine could overheat and be badly damaged.
The repair cost would not be covered by the vehicle
warranty. Too much water in the mixture can freeze
and crack the engine, radiator, heater core, and other
parts.
Notice:If extra inhibitors and/or additives are used
in the vehicle’s cooling system, the vehicle could
be damaged. Use only the proper mixture of
the engine coolant listed in this manual for the
cooling system. SeeRecommended Fluids and
Lubricants on page 6-12for more information.
5-35

5. Replace the pressure cap. Be sure the pressure
cap is hand-tight and fully seated.
Check the level in the surge tank when the system
has cooled down. If the coolant is not at the proper
level, repeat Steps 1 through 4, then reinstall the
pressure cap. If the coolant is not at the proper
level when the system cools down again, see your
dealer/retailer.
Notice:If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.
Engine Overheating
The vehicle has several indicators to warn of engine
overheating.
There is an engine coolant temperature gage on
the instrument panel cluster. SeeEngine Coolant
Temperature Gage on page 3-41. The vehicle may
also display a COOLANT OVER TEMPERATURE
message on the Driver Information Center (DIC).
SeeDIC Warnings and Messages on page 3-54
for more information.You may decide not to lift the hood but to get service
help right away. SeeRoadside Assistance Program
on page 7-7.
If you do decide to lift the hood, make sure the vehicle
is parked on a level surface.
Then check to see if the engine cooling fan is running.
If the engine is overheating, the fan should be running.
If it is not, do not continue to run the engine and have the
vehicle serviced.
Notice:Engine damage from running your engine
without coolant is not covered by your warranty.
SeeOverheated Engine Protection Operating Mode
on page 5-41for information on driving to a safe
place in an emergency.
Notice:If the engine catches re while driving
with no coolant, the vehicle can be badly damaged.
The costly repairs would not be covered by the
vehicle warranty. SeeOverheated Engine Protection
Operating Mode on page 5-41for information on
driving to a safe place in an emergency.
5-39

If Steam Is Coming From Your Engine
{CAUTION:
Steam from an overheated engine can burn you
badly, even if you just open the hood. Stay away
from the engine if you see or hear steam coming
from it. Turn it off and get everyone away from the
vehicle until it cools down. Wait until there is no sign
of steam or coolant before you open the hood.
If you keep driving when the vehicles engine is
overheated, the liquids in it can catch re. You or
others could be badly burned. Stop the engine if
it overheats, and get out of the vehicle until the
engine is cool.
SeeOverheated Engine Protection Operating Mode
on page 5-41for information on driving to a safe
place in an emergency.
If No Steam Is Coming From Your
Engine
If an engine overheat warning is displayed but no
steam can be seen or heard, the problem may not be
too serious. Sometimes the engine can get a little too
hot when the vehicle:
Climbs a long hill on a hot day.
Stops after high-speed driving.
Idles for long periods in traffic.
If the overheat warning is displayed with no sign of
steam:
1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and
to the highest fan speed. Open the windows as
necessary.
3. If in a traffic jam, shift to N (Neutral) while stopped.
If it is safe to do so, pull off the road, shift to
P (Park) or N (Neutral) and let the engine idle.
5-40

If the temperature overheat gage is no longer in the
overheat zone or an overheat warning no longer
displays, the vehicle can be driven. Continue to drive
the vehicle slow for about 10 minutes. Keep a safe
vehicle distance from the car in front of you. If the
warning does not come back on, continue to drive
normally.
If the warning continues, pull over, stop, and park the
vehicle right away.
If there is no sign of steam, idle the engine for
three minutes while parked. If the warning is still
displayed, turn off the engine until it cools down.
Also, see “Overheated Engine Protection Operating
Mode” next in this section.Overheated Engine Protection
Operating Mode
This emergency operating mode lets the vehicle
be driven to a safe place, up to 50 miles (80 km),
in an emergency situation. If an overheated engine
condition exists and the messages COOLANT OVER
TEMPERATURE and REDUCED ENGINE POWER
are displayed, along with the check engine light, an
overheat protection mode which alternates ring groups
of cylinders helps prevent engine damage. In this mode,
there is a signicant loss in power and engine
performance.
Driving extended distances 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 5-20.
5-41

Engine (cont.)
Oil Pressure Gage.......................................3-46
Overheated Protection Operating Mode...........5-41
Overheating................................................5-39
Starting......................................................2-23
Entry/Exit Lighting...........................................3-18
Event Data Recorders.....................................7-17
Extender, Safety Belt.......................................1-25
Exterior Lamps...............................................3-14
Exterior Lighting Battery Saver..........................3-17
F
Filter
Engine Air Cleaner......................................5-28
Finish Damage.............................................5-100
Flashers, Hazard Warning.................................. 3-6
Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-90
Floor Mats.....................................................2-51
Fluid
Automatic Transmission................................5-30
Power Steering...........................................5-42
Windshield Washer......................................5-43
Fog Lamp
Fog ...........................................................3-16
Fog Lamp Light..............................................3-47
Front Air Dam................................................2-21Fuel............................................................... 5-6
Additives...................................................... 5-7
California Fuel.............................................. 5-7
Driving for Better Economy............................. 4-2
Filling a Portable Fuel Container....................5-12
Filling the Tank............................................. 5-9
Fuels in Foreign Countries.............................. 5-8
Gage .........................................................3-48
Gasoline Octane........................................... 5-6
Gasoline Specications.................................. 5-6
Fuses
Engine Compartment Fuse Block.................5-106
Fuses and Circuit Breakers.........................5-103
Instrument Panel Fuse Block.......................5-103
Windshield Wiper.......................................5-102
G
Gage
Boost.........................................................3-49
Engine Coolant Temperature.........................3-41
Engine Oil Pressure.....................................3-46
Fuel..........................................................3-48
Speedometer..............................................3-34
Tachometer.................................................3-34
Voltmeter Gage...........................................3-37
Garage Door Opener.......................................2-44
5

O
Odometer......................................................3-34
Off-Road Recovery..........................................4-13
Oil
Engine.......................................................5-20
Engine Oil Pressure Gage............................3-46
Oil, Engine Oil Life System..............................5-26
Older Children, Restraints................................1-25
One-to-Four Shift Light....................................3-38
Online Owner Center........................................ 7-5
OnStar, Privacy..............................................7-18
OnStar
®System, see OnStar®Manual...............2-40
Operation, Universal Home Remote System........2-44
Outlet Adjustment............................................3-29
Outlets
Accessory Power.........................................3-23
Outside
Automatic Dimming Mirror.............................2-39
Convex Mirror.............................................2-40
Heated Mirrors............................................2-40
Power Mirrors.............................................2-39
Overheated Engine Protection Operating Mode . . . 5-41
Owner Checks and Services.............................. 6-9
Owners, Canadian............................................... ii
P
Paint, Damage..............................................5-100
Park
Shifting Into................................................2-33
Shifting Out of............................................2-34
Park Brake....................................................2-32
Parking
Over Things That Burn.................................2-35
Parking Your Vehicle.......................................2-34
Passenger Airbag Status Indicator.....................3-36
Passenger Compartment Air Filter.....................3-30
Passenger Sensing System..............................1-53
Passing.........................................................4-13
Perchlorate Materials Requirements, California...... 5-4
Phone
Bluetooth
®..................................................3-96
Power
Door Locks.................................................2-12
Electrical System.......................................5-102
Lumbar and Side Bolsters.............................. 1-3
Retained Accessory.....................................2-23
Seat............................................................ 1-3
Steering Fluid.............................................5-42
Windows....................................................2-17
9