1993 CHEVROLET CORVETTE service

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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.

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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 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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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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Brake Master Cylinder
Your brake master cylinder is filled with
DOT-3 brake fluid.
There are only two reasons why the
brake fluid level
in your master cylinder
might go down. The first is that the
brake fluid goes down to an acceptable
level during normal brake lining wear.
When new
linings are put in, the fluid
level goes back up.
The other reason is that fluid is Iealring
out
of the brake system. If it is, you
should have your brake system fixed,
since
a leak means that sooner or later
your brakes won’t work well, or won’t
work at all.
So, it isn’t a good idea to “top off” your
brake fluid. Adding brake fluid won’t
correct
a leak. If you add fluid when
your linings are worn, then you’ll have
too much fluid when you get new brake
linings. You should add (or remove)
brake fluid,
as necessary, only when
work
is done on the brake hydraulic
system.

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.-
WETen your brake fluid falls to a.low
level,
your brake warning light,
SERVICE ABS light and SERVICE
ASR light will come on. The- anti-lock
brake and .acceleration
slip regulation
systems are disabled when your brake
flu.id falls to
it low level. See thedndex
under
Brake System Warning Light;
To Add Brake Fluid:
Lift the cap and pour in fluid to the
MAX mark on the master cylinder. Do
not oveffiI1.
&%at to Add:
When you do need brake fluid, use-
)nly
DOT-3 brake fluid-such as
lelcrr Supreme 1P (GM Part No.
.052535). Use new brake fluid from a
'eded. container only.
NOTlCE
Replacing Brake System Parts
The braking system on a modern
vehicle is
complex. Its many parts have
to be
of top quality -and work well
together if the vehicle is to haye really
good braking. Vehicles we design and
test have top-quality GM brake-parts in
the&, as
your Corvette does when it is
new. When you replace parts of your
braking 'system-for example, when
your brakelinings wear down and you
have to have new ones put in-be sure
you get new genuine GM replacement
parts. If.you don't, your brakes may no
longer work properly. For example, if
someone.puts
in b.r&e linings that are
wrong for your vehicle, .the balance
between your
front and rear brakes can
change, for the worse. The braking
performance
you've come to expect can
change in many other ways if.-someone
puts
in the wrong replacement brake
parts.
27 I

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Battery
Every new Corvette has a Delco
Freedoma battery. You never have to
add water to one of these. When it's
time far a new. battery, we recommend. a
Delco
Freedom* battery. Get one that
has -the catalog number shorn on the
okiginal battery's label.
Jump Starting
For jump starting iqs.tructions, see the
Iizdex under Jump Starting
Vehicle Storage
If you're not going to drive your vehicle
for 25 days or 'more, take off the black,
negative
(-1 cable from the battery. This
wit1 help keep your battery from
.running down,
Contact your dealer to-learn how to
prepare your vehicle far longer storagg
mriods.
272