CHEVROLET CORVETTE 1993 4.G Owners Manual

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Manual Transmisskm fluid
(CONT.)
Check the fluid level only when your
engine is
off, the vehicle is parked on a
level place and the transmission is cool
enough for you to rest your fingers on
the transmission case.
Then, Follow These Steps:
1. Remove the filler plug.
2. Check that the lubricant level is up to
the bottom .df the filler plug hale.
3. If the fluid level is good, install the
plug and be sure it is fully seated. If I
the fluid level is low, add more fluid
as described in the next step.
260
How to Add Fluid:
When you need to add fluid, put in
enough to, bring the level up to -the
bottom of the filler plug hole in the
transmission case. Refer to the
Maintenance Schedule to determine
what
kind of fluid. to use. See the Index
under Fluids G Lubricants.
I
.. .. ,.*Ti
Hydraulic C/ufch
(MANUAL TRANSMISSION)
The clutch linkage in your vehicle is
self-adjusting.
When to Check and What to Use:
Refer to the Maintenance Scheduleb bo
determine how often you should check
the fluid level in your clutch master
cylinder reservoir
and what to add. See
the Index under Owner Checks G.
Sewices and Fluids ,& Lubricants.
HOW to Check and Add Fluid
The clutch master cylinder is under
the Engine Control Module (ECM) in
the left rear area of the engine
compartment.
To check the fluid, look at the area
between the
ECM and the battery.

Downloaded from www.Manualslib.com manuals search engine To add fluid, the ECM unit rnust.be
moved.
Loosen the two nuts-on the ECM unit.
With the
LT1 engine, there is one nut
on the outboard side
o€ the ECM unit
-and
one nut on the inboard side. With
the
LT5 engine, both nuts are on the
inboard side
of the ECM unit.
Move the unit to either side. Do not
disconnect
any wires.
Fluid should be added if the fluid level
iS at
or below the ADD mark on the
reservoir. There are additional.
instructions on the
reservoir cap.
When returning the
ECM to its proper
pasition, make
sure the bolts are
aligned with the: slotsin
the bracket.
Then gently push
down on the unit.
When.replacing
the unit, be careful not
to overtighten the nuts.
Rear Axle
When to Check Lubricant:
Refm to the Maintenance Schedule to
determine how often to check the
lubricant. See the
Index under Periodic
Maintenance Inspections.
How to Check Lubricant:
If the-levelis below the bottom 0.f the
filler
plug hole, you'll need to add some
lubricant, Add enough lubricant to raise
the level to the bottom of the filler plug-
hole.
26 I

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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.

Downloaded from www.Manualslib.com manuals search engine 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
stiU. some pressure. Wait €or the
hiss to stop. Then press down on
the pressure cap and continue
turning
it to the left. Remove the
pressure cap.
A
YOU -can be burned if you,. '.
spill coolant on hot .engine
parts.' Coolant contains ethylene
glycol, .and .it .will burn if the engine
parts
are hot enough. Don't spill
coolafit
on .a hot engine.

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Adding Caalant-LT5 Enghe
(CONT,)
2. Add the coolant mix to the coolant
high fill reservoir until the level
reaches the
base of the res&voir filler
neck
3. With the pressure cap still removed,
run the engine until the upper
radiator
hose is hot. With the engine
at idle, add coolant
mix again, if
needed, to bring the level back up to
the reservoir filler neck base.
4. Put on the pressure cap. When it’s
tight, the arrows on the cap should
line up with the overflow tube on the
reservoir filler neck.
Coolant High Fill Reservoir
Pressure Cap
I
When you replace your coolant high fill
reservoir pressure cap, an AC@ cap is
recommended. Engine
coolant temperature
is
controlled by a thermostat in the engine
coolant
system. The thermostat sfops
the flow of coolant through the radiator
until the .coolant reaches a preset
temperature.
When you replace your thermostat, -an
AC* thermostat is recommended.

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How To Check Power Steering Fluid
Unscrew the cap and wipe the dipstick
with a clean-rag. Replace the cap and
completely tighten
it. Then remove the
cap again and look
at- the fluid level on
the dipstick,
When .the engine imnpartrnent is hot,
the level should be at the HOT or H
mark.
cool, the level should be atthe FULL
COLD or C mark.
When the engine compartment is
What t,o Add:
Refer to the Maintenance Schedule- to
determine what.kind
of fluid to use. 'See.
the
Index under Fluids G Lubricants.
II NOflCE
Windshield Washer Fluid
To Add:
Open t,he.cap labeled WASHER .
FLUID ONLY. Add washer fluid until
the^ bottle is full.
.