engine coolant CHEVROLET CORVETTE 1993 4.G Owner's Manual

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How to Add Coolant to the Coolant
High Fi/l Reservoir-LT5 On/y
1. YQU can remove, the coolant high fill
reservoir pressure cap when the
cooling system, including.the coolant
high fill reservoir pressure cap and
upper radiator hose, is no longer hot.
Turn the pressure cap slowly to the
left until it first stlaps. (Don't press
down while turning the pressure
cap .)
If you hear a hiss, wait for that to stop.
A hiss- means ther,e is still some pressure
left.
122
2. Then keep turning. the pressure cap,
-but
now push down as you turn it.
Remove the pressure. cap.
3. Fill the coolant high fill reservoir with
the proper mix, .up to the base of the
filler neck.

Downloaded from www.Manualslib.com manuals search engine 4. Then fill the coorant recovery tam to
the HOT mark an the.dip$tick..
-5.. Put the cap back on the- coolant.
recovery tank, but leave the coolant
high fill reservoir pressure cap off.
6. Start the engine and let it m until
y~u can feel the upper radiator hose-
getting hot. Watch out for the engine-
fans.
7. By this time the coolant level inside
the coolant high fill reservoir filler
neck may be -lower. if the level is
lower, add more of the proper mix
thxough the filler neck until the level
reaches..the base of the Tiller neck.

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Service & Appearance Care
:A Electric. fansunder the hood
can stariup and .injure yuu
even when the engine is not
running. Keep hands, clothing and
tools away frornany underhood
electric
fan.
46
CAUTION
A
Things that burn can get on
hot engine parts and start a
fire. These include liquids like
gasoline,
oil, coolant, brake fluid,
windshield washer and other fluids,
and plastic or rubber. You or others
could be burned. Be careful not to
&op or spill things that will bum
onto a hot engine. Before
closing the
hood, be sure all the
filler caps are on. Then release the
hood
safety strut by moving the strut to the
centered position and lowering the
hood.
Lower the hood'until it is approximately
12 inches (30 cm) above the engine
compartment, then release it. This
should securely latch the hood.
If the hood is still not fully closed and
latched, repeat the
closing procedure by
holding the
hood a little higher before
you release it.

Downloaded from www.Manualslib.com manuals search engine 0 Y6105
LT7 hgine (CODE PI
t a Automatic Transmission Fluid
2. Hydraulic Clutch Fluid Reservoir
3. Battery
4. Brake Fluid Reservoir
5. Air Cleaner
Dipstick
(if equipped)
(if equipped)
6. Coolant Recovery
Tank
7. Power Steering Fluid Reservoir
8. Engine Oil Fill Cap
9. Engine Oil Dipstick
IO. Coolant High Fill Reservoir
11. Windshield Washer Fluid Reser aoir

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\!
1 LT5 Engine (CODEJ)
1. Hydraulic Clutch Fluid Reservoir
2. Battery
3. Brake Fluid Reservoir
4. Power Steering Fluid Reservoir
5. Air Cleaner
6. Coolant Recovery Tank
7. Engine Oil Fill Cap
8. Engine Oil Dipstick
9. Coolant High Fill Reservoir
IO. Windshield Washer Fluid Reservoir
.I. 248

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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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1. When the..engine-is cool, remove the
pressure .cap.
.Without pressing down on the
pressure cap, turn it slowly to the.
left .until.it reaches a “stop.”
If YOU hear a hiss, it means there is
still some pressure. Wait for the
hiss to stop. Then press down on
the pregsure- cap and continue
turning it to the left. Remove the
pressure cap.
2. After the engine cools, open the air
bleed valves on the throttle body and
water pump inlet.
3.. fill with the proper mix. Add .coolant
until. you see a steady stream of.
coolant corning .frarn.the bleed vdves.
4, Then close the bleed valves.
5. Continue to fiH the coolant high .fill.
reservoir u.p to the base of the €iller
neck.
6. Rinse or wipe the spilled crrolant
from the engine-and compartment.
7. Start the engine-and allow it .to.run in
idkfor
approximately four minutes.
By this time, the coolknt level inside

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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.