1993 CHEVROLET CORVETTE engine overheat

Downloaded from www.Manualslib.com manuals search engine Problems on the Road
If No Steam is Coming from Your
Engine:
If you get the overheat warning but see
or hear no steam, the problem may not
be too serious. Sometimes the engine
can get .a Me too hot when you:
9 Climb a long hill on a hot day.
4 Stop after high speed driving.
Idle for long periods in traffic.
If you get the overheat warning with no
sign of steam, try this for a minute or so:
1 I Turn off your air conditioner.
2. Turn on your heater to €ull hot at the
highest
fan speed and open the
window as necessary.
3. Try to keep your engine under load
(in
a -drive gear where the engine
runs slower).
If you no longer have the overheat
warning,.you
cm drive. Just to be safe,
drive slower for about ten minutes., If
the warning doesn't co~e back on, you'
can drive normally.
I€ the warning continues, pull over,
stop, and park your vehicle right away.
If there's still no sign of steam, you can
idle the engine for two or three minutes
while you're parked, to see jfthe
warning
stops. But then, if you still
have
the warning, TURN OFF THE
ENGINE AND GET EVERYONE OUT
OF THE VEHICLE until it cools down.
You- may decide not to l.23 the ho0.d but
to get service help right away.
r
e

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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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Adding only plain:water.to
yam cooling system can be
dangerous. Plain water, or some
other .liquid like alcohol, can boil
before the proper coolant mix will.
Your vehicle's coolant warning
system is set for the proper coolant
mix. With plain water or the wrong
mix, your engine could get too hot
but
you wouldn't get the overheat
warning. Your engine could catch
fire and you or others could be
burned. Use a 50/50 mix of clean
water and a proper antifreeze.
You can'bebumed if you
. -spiU"CoolaZit hot engine '
parts. Coolant contains'ethylene
glycol and it will burn .if the engine
parts are hot enough. Don't spill
coolant on a hot engine.
When the coolant in the coolant
recovery
tank is at or above COLD,
start your vehicle.
If the overheat warning continues,
there's one more thing you can try. You
can add the proper coolant mix directly
to the coolant high fill reservoir, but be
sure the cooling system is cool before you
do it.
3

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c-
If You’re Stuck: In Sand, Mud,
Ice or Snow
What you don’t want to do when your
vehicle is stuck is to spin your wheels.
The method
known as “rocking” can
rou must use caution. I help you get out when you’re stuck, but
CAUT/UN I
A: If :you let.your :tires. spin -at
high speed.when the ASR
, . ‘OFE warning light is on, or when
“the SERVICE ASR warning light is
‘on, your tires can explode and you
or others could be injured. And,
spinning your tires with either of
these lights on can cause the
automatic transmission
or other
parts of the vehicle to overheat.
That could cause an engine
compartment fire or other damage.
When you’re stuck, spin the wheels
as little as possible. Don’t spin the
wheels above 35 mph (56 M) as
shown on the speedometer.
Rocking Your Vehicle to Get It Out:
First, turn your steering wheel left and
right. That will clear the area around
your front wheels. You should turn your
ASR system off. Then, shift back and
forth between R (Reverse) and a
forward gear--or if you have a manual
transmission, between 1 or 2 and
R (Reverse)-spinning the wheels as
little as possible. Release the accelerator
pedal while
you shift, and press lightly
on the accelerator pedal when the
transmission is in gear.
If that doesn’t
get
you out after a few tries, you may
need to be towed out.
If you do need to
be towed
out, see the Index under
Towing Your Corvette and Acceleration
Slip Regulation (ASR) System.
237

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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

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Adding Coolant-LT1 Engine
(CONT,)
the coolant high fill resekvoir will be
lower.
Add more of the proper mix
through the filler neck until the level
reaches the
base of the filler .neck.
8. Replace the pressure cap. When it's
tight, the arrows on the cap should
line up
with the overflow tube on the
reservoir filler neck. Shut the engine
Off.
9. Then fill the coolant .recovery t,mk to
the proper level.
For complete drain, flush and refill,
contact your Chevrolet dealer
or the
procedure
may be found in a Chevrolet
Corvette Service Manual. To purchase a
Service Manual, see the-Index under
Service Publications.
Adding GooCant-LT5 hgine
To Check Coolant:
When your engine is cold, check the-
dipstick on the cap of the coolant
recovery
tanfr. The coolant level should
be at COLD or a little higher. When
your engine is warm, the level on the
dipstick
should be up to HDT, or a
little higher. If your engine is
overheating, see the
Index under
Evlgirze Overheating.
Your Corvette also has a coolant high
fill reservoir located at the right rear of
the engine'compartrnent.
To Add Coolant:
For more .information on ,adding coolant
to the LT5 engine, see the Index u.nder
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 isvery low or empty, also
add coolant to the coolant high fill
reservoir.
Add coolant to the base of the filler
neck, if needed.