1993 CHEVROLET CORVETTE overheating

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How to Use this Manual
Ushg Your 7993 Corvette
Owner’s Manual
Many people read their owner’s manual
from beginning to end when they first
receive their
new vehicle. This will help
you learn about
the features and
controls for
your vehicle. In this
manual, you’ll find that pictures and
words
work together to explain things
quickly.
There
are nine parts with color-tabbed
pages
in this manual. Each part begins
with
a brief list of contents, so you can
usually tell at a- glance if that part
contains the infomation you want.
You can bend the manual slightly to
reveal the color tabs that help-
you find a
Part.
--
L.
Part 1: Seats & Safety Belts
This part tells you how to use your seats
and safety belts properly.
Part 2: fleatures & Controls
This part explains how to start and
operate your Corvette.
Part 3: Comfort Controls & Audio
Systems
This part tells you how to adjust the
ventilation and com€ort controls, and
how to
operate your audio system.
Part 4 Your Driving and the Road
Here you’ll find helpful information an(
tips about the road and how to drive
under different conditions.
d
Part 5: Problems on the Road
This part tells you what to do if you
have a problem while driving, such as a
flat tire
or engine overheating.
Part 6 Senrice & Appearance Care
Here the manual tells you how to keep
your Corvette
running properly and
looking good.
Part 7: Maintenance Schedule
This part tells you when to perform
vehicle maintenaxice
and what fluids
and hbricm‘ts to use.
Part 8: Customer Assistance
IHormation
This part tells you how to contact
Chevrolet for assistance and how to get
service publications. It also gives you
information on Reporting Safety
Defects.
Part 9: Index
Here’s an alphabetical listing of almost
every subject in this manual. You can
use it to quickly find something you
want to read.
Service Station Information
This is a quick re€erence of service
information.
You can find it on the last
page of this manual.

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This gage shows the engine coolant
temperature,
I If the gage pointer moves-into the shaded
area, yow-engine is too
hot! It meamthat
your engine coolant
has overheated. If
you have, been operating your vehicle
under-
normal driving. conditions, you
should pull off the road, stop your
vehicle and turn off the engine as soon
as possible.
HOT COOLANT CAN BURN YOU
BADLY!
In Problems on the Road, the- manual
shows what to do. See the Ifidex under
Engine Overheating.
For -accurate gage measurements refer
to the
GAUGES button on the Trip
Monitor
(see Trip Monitov later in this
section).
If the LOW COOLANT light, located
-on the Driver Information Center,
comes on, your system is low on
coolant -and your engine may overheat.
Brake System Warning Light
Your Corvette’s hydraulic brake system
is divided.into two parts. If one part
isn’t working, the other part can still
work
and stop you. For good braking,
though,
you need both parts working
well.
If the warning light goes on, there could
be a brake problem. Have-your bralce
system inspected right away.
This light should come on as you start
the vehicle. If it doesn’t come on then,
have it
fixed.so it will be ready to warn
you if there’s a problem.
.-

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same problems that can occur on
the road.
Part 5
Problems on the Road
Hazard Warning: Flashers +.. ........................................................................\
.... 204
Jump Starting ............ $. ..... (.. ............................ .,. ............................................... .-. 205
Towing Your Corvette ........................................................................\
................ 208
Engine:Overheating 21 3
If a Tire Gdes Flat ........................................................................\
........................ 224
Changing a Flat Tire ........................................................................\
.................... 225
C.ompact Spare Tire ..;.. ........................................................................\
................. 236
”4 ........................................................................\
.................
If You‘re Stuck: In. S.md, Mud, Tce or Snow .................................................... .. 237
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203 . =

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Engine Overheating
Y0.u will find an engine coolant
temperature gage. on. the instrument
cluster and a low coolant warning light
on the Drives In€orrnation Centkr.
Ifsteamis

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Engine Overheating (COW.)
A Heater adradiator hoses, ’.-
.and oiher enginelparts, can
.be.very-hot. Don’t touch them ...If
you do, you canbe burned.
Don’t run the engine
if there is a
leak. If
you run the engine,.it could
lose all coolant. That could cause
an engine fire, and you could be
burned. Get any leak fixed before
you drive the vehicle.
216
If there seems to be no leak, check to
see
if the electric engine fans are
running.
If the engine is overheating,
both fans
should be running. If they
aren’t, your vehicle needs service.
How to Add Coolant to the Coolant
Recovery Tank
If you haven’t found a problem yet, but
the coolant level isn’t at
or above
COLD,
add a 50/50 mixture of clean
water (preferably distilled) and a proper
antifreeze at the coolant recovery tank.
(See the
Index under Coolant for more
information about the proper coolant
mix. )

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262
Rear Axle (CONT~)
What to Use:
To add lubricant when the level
use Me Lubricant (GM Part Na
12345977) or SAE BOW-90 GL-5
lubricant. To completely refill after
-draining, add four ounces (118 mQ af
Limited-Slip Dlfferential Lubricant
Additive (GM Part No. 1052358). Zmn
fill to the bottom of the filler plug hole
with Axle ‘Lubricant (GM Part No.
12345977) o,r SAE 8OW-90 GL-5 gear
lubricant.
Engine Coolant
e foUowing explains your cooling
sgstm and how to add coolant when it
is Im. If you have a problem with
e~@e overheating, see the Index under
Engine Ouerheating.
The proper coolant for your Corvette
* Give freezing protection down to
Give boiling protection up. to 262°F
Protect against rust and corrosion.
Help keep the proper engine
Let the warning lights work as they
-3m (-37°C).
(128°C) ~
temperature.
should.
What to Use:
Use a mixture of one-half clean wafer
(preferably distilled) and one-half
antifreeze that
meets “GM Specification
1825-M,” which won’t damage
aluminum parts. You can also use a
recycled coolant conforming to GM
Specification 1825-M with a complete
coolant
flush and refill. If you have the
LTl engine, use GM Engine Coolant
Supplement (sealer)
with any complete
coolant change.
If you use these, you
don’t need to add anything else.

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Adding Coolant-LTI Engine
Tb Check Coolant:
Wh& your engine is cold, :che.ck the
dipstick on the cap of the coolant-
recovery .tank. The. coolant level should
be at C.OLD, orst little higher. When
your engine-is wm, the level on the
dips’tiik should be up to HOT, or a
little higher. If your engine is
overheating, see the Index under
Engine Overheating.
Your Corvette als:o- has .a coolant high
fill res.Crvoir lgcated at the-right re,ar of
the engine compartment.

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Adding CooIant-LTI €ngine
(CONT.)
To Add Coolant to the Coolant
Recovery Tank:
For more information on adding coolant
to the LT1 engine, see the Index under
Engine Overheating.
If you need more coolant, add the
proper
mix at the coolant recovery
tank, but only when your engine is cool.
If the tank is very low or empty, also
add coolant to the coolant high fill
reservoir. See the following procedure
and refer to the Index under Engine
Overheating.
264
To Add Coolant to the High Fill
Reservoir:
L
the engine and cooling system are
hot-can allow steam and -scalding
.liquids to blow out and burn you
badly. Never turn the pressure
cap-even a Me-when the engine
and cooling system are hot.
4
NOTICE