engine overheat CHEVROLET CORVETTE 1993 4.G User Guide

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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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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.

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Electronic Heating and Air
Conditioning
The blower motor for the ,optional
(C683 Automatic Electronic Climate
Control 6yst.em is protected by a 5-amp
underhood- fuse. -See your dealer for
service.
Headlight. Wiring
The headlight wiring is protected by a
circuit breaker in the.Iight switch, An
electrical overload will cause the lights
to go on and off, QT in some cases to
remain o€E. If this happens, have your-
headlight system checked right away.
Windshield. Wipers
The windshield wiper- motor is
protected.
by a circuit breaker and a
fuse. If the rn0to.r overheats due to
heavy snow, etc., the wiper will stop
until the. motor cools. If, the overload is
caused by some electrical problem, 'ham
it
fixed.
Power Windows and Other
Power Options
Circuit breakers in the 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.proHern is
fixed.

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...
'Emergencies. Braking ....................... 178
Emergencies. Steering in ................. 180
Emergency Starting .......................... 205
Emergencies on the Road ................. 203
Emergency Towing .......................... 208
Engine Block Heater ......................... 66
Engine
Engine Coolant Temperature
Gage ............................................... 106
Engine Cooling System .................... 262
Engine Exhaust ..................... 79, 80, 200
Coolant .......... 216, 262, 263, 311, 317
Engine Identification ......................... 304
Engine Oil ........................................ 249
Capacity .......................................... 3 1 f
Energy Conserving ......................... 252
Low Oil Light ................................. I X8
Additives ....................................... 253
Checking 81 Adding .............. 249. 250
Disposing of Used Oil .................... 254
Pressure Gage ............................... 103
Substitute ........................................ 253
Temperature Gage ......................... 104
When to Change ............................. 253
Engine Oil Life Monitor .................. 109
Engine Overheating ......................... 213
160
Engine Power Curves ....................... 319
Engine Power Key ............................. 56
Engine Power Switch ........................ 74
Engine Specifications ....................... 313
Engine, starting
Automatic Transmission ................. 63
Manual Transmission ..................... 65
Ethanol in Gasoline .......................... 242
Exhaust
Dangerous Gas in ....... 59, 79,80, 200
Parking with the.Engine
Expectant Mothers, Use of
Expressway Driving ......................... 191
Extender, Safety Belt .......................... 37
Exterior Appearance
Running ............................ 67, 78, 80
.Safety Belts ...................................... 31
(see Appearance Care)
Rbric cleaning
(see Appearance Care)
Fabric Protection ............................. 291
Fan Warnings ........... 206, 207, 215, 246
Fiberglass Springs ............................ 303
Filliig the Fuel Tank ....................... 244
Filter
Air Cleaner ............................. 254, 312
Oil ........................................... 253, 312
Finish. Damage ................................... 302
Flashers, Hazard
Warning ......................................... 204
Flat Tire ............................................ 224
Storing a .Flat-& cept ZR-l .......... 233
StoMg a .Flat-Z R-1 ..................... 234
Flooded Engine ............................ 62, . 64
System ............................................ 145
Capacities ....................................... 311
Hydraulic Clutch ............................. 260
Power Steering .............................. -269
Rear Axle ................................ 261, 318
Windshield Washer .......... 84,269, 318
plow-Through Ventilation
Pluid
Brake ..................................... 270, 317
Transmission ................. 256, 311, 317
Fluids & Lubricants ........................ 317
Fog, Driving in ................................ 189
Fog Light Bulb Replacement ... 275, 314
Freeway Driving ............................... 191
Fog Lights ............................................ 92

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.
.
Hills. Parking an ................................. 1y6
Hwd Release .. .._ ................................. 245
Safety Warning ................................ 246
Warning,. Overheated Engine ........ 2:13
Horn .................................................... 8.1.
Hot Engine, Safety
Warni&s ......... ZG, 2.16, 24.6, 267, 271
How to.Use This Manual ....................... 9
-Hydroplaning .................................... 188;
HOW the Anti-Lock' System WO&S ..... 174
Hy&aulic Clutch Fluid ..................... 260
Zdentificatim Humxer. VeKcle ...... 303
Idling Your Engine ...................... 67 ,. 78
If-Y0u'r.e Stuck:: In S.and., Mud,
Ice ar Snow ............................ 201, 237
'XgnWm
Key ........ ........................................... 42
Pos~tl.ons ..,............................................. 6p ....
mtlmixiated EII~ system ..................... 57
Indicator Lights (s.ee Warning Lights)
Infant Restraint (see Child Restraints)
. Idatable Restmint ............................. 26
Inflatable Restraint Light. ........... 27, 115
.Infiation, Tires .................. ....-.. ........... 282 .
3.6 I I 1'