1993 CHEVROLET CORVETTE engine coolant

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Heating and VentMion
In these settings, the air conditioner
compressor doesn't
run. Outside air
enters the vehicle as indicated. For each
setting, adjust the temperature control
lever and
-fan speed as desired.
flows through the instrument panel
outlets.
*A (Hwt): .In this setting, most air
flows through heater ducts near the
floor. Some
air will also flow through
the defroster vents.
If your vehicle has an engine block
heater and you use it during cold
weather,
0°F (-18°C) or lower, your
heating system will more quickly
provide ,heat
because the engine coolant
is already warmed. See the Index under
Engine Block Heater.
4
(Vent): In this setting, outside air
Defogging and Defrosting
YoUr vehicle has two settings for
clearing your windows. The-air
conditioner
compressor will run in both
of these settings to remove moisture
from the air when the temperature is
above freezing. For each setting, adjust
the temperature control
lever and fan
speed as desired.
(@ (Defrost): This setting directs
90% of the air through the windshield
defroster vents
and the side window
vents, and 10% though the floor heater
ducts.
To defrost the windshield, slide the
temperature control lever
to the far right,
press the (@ button, and adjust the
fan to the highest speed.
For rapid
defrosting,
90% of the air will be
directed to the windshield and side
window vents.

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Automutic Electrunic
Climate Cuntvul (C0nt.j
Use These Settings to Set Your Fan
Speed
V (Lqw.Ean): 'This. setting overrides.
the automatic fan speed. To decrease
fan speed, press the
V button and
hold until
you see the fan speed you
want.
AUTO # (Automatic Fan): when
you use this setting, the controller
chooses the fan speed based on the
input signals.
In the AUTO mode
during hot weather (after the vehicle
has not been running for a period of
time) the-fan speed will be
low when
the vehicle is initially
started. This
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initial low fan speed is used to purge
the vehicle of hot interior air. In the
AUTO 3f mode during cold weather,
the
fan speed will be delayed. in the
heat
mode until the engine coolant
reaches
an adequate temperature to
provide heat.
A (High .Fan) : This setting overrides
the automatic fan speed. To increase
fan speed, press the A button and
hold until you see the fan speed you
want. There is no €an blower delay.
Fan speeds wil1 range from 1 (lowest
setting)
to 10 (highest setting). When
any fan speed is selected, it will appear
on the digital screen briefly and the
ot~tside temperature will also appear.
Air Conditioning System
If a light above a button flashes when
you turn
on the ignition, it may indicate
an electrical problem with your air
conditioning system. The flashing will
continue for one minute, then go but. It
means you should have your system
checked
and serviced if needed.
It may
also mean the rekigerant level is
too low in your air conditioner system.
The. light will still flash after rebigerant
is added. This means your system will
not cool the air until it is reset.

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Comfort Controls & Audio Systems
Directional Controls (CONT.)
also controls the fan speed
-automaticallyy, unless the fan is
overridden
by the 7 or A button.
'YJJ(Heater): In this setting, all air
coming into the vehicle. is forced to the
floor. The fan blower motor will vary
in speed unless yowpress the Vur A
button. The in-car temperature will
adjust to the setting you choose. The
air conditioning compressor will not.
run in the manual heater mode.
If .your vehicle has an
engine block
heater
and you.use .it during cold
weather,
UoF (-18°C) or lower, your
heating system will .more quickly
provide heat became the engine coolant
is already warmed. See the
Index under
Engine Bluck Heater.
44
(Defrost): With this setting,
mast
of the air is forced. through the
windshield defroster vents. The
cornpressor
runs by using all the input
signals. The fan blower also .goes to a
fixed
high speed with no delay. After
start-up you can override the High fan
blower speed by pushing or AUTO.
DEFOG: Press the and (@'
buttons at the same time to operate the
defog mode. This directs warmed air
through the windshield defroster
vents,
and through the heater ducts.
OFF: Press to turn off the system.
Rear Window Defogger
(COUPE AND HARDTOP CONVERTlBLE)
a (Rear Window Defogger) :Press
this button to warm the defogger grid
on the rear window and
warm the
power mirrors. The indicator light will
glow while the rear window defogger is
operating.
If you have a convertible,
you. will have the 4 (Power Mirror
Defogger) button .on your climate
control system. This button
is for
heated mirrors only. The -rear window
defogger
will turn:off automatically after.
about
10 minutes. of use, You can also-
turn the defogger
off by turning off the
ignition
or by pressing the @ button
again.

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Torque Lock
(AUTQMATIC TRANSMISSION)
If you are parking on a hill and you
don’t shift your transmissian into
P (Park) properly, the weight of the
vehicle may put
too much force on the
parking pawl in the transmission. You
may find it difficult to pull the shift
lever out of
P (Ihrlr). This is called
“torque
lock.” To prevent torqu’e lock,
always
be sure to shift into P (Park)
properly before you leave the driver’s
seat.
To find out how, see the Index
under Shifting Into P (Park).
When you are ready to drive, move the
shift lever out
of P (Park) before you
release the parking brake.
If torque lock does occur, you may need
to. have another vehicle push yours a
little uphill to take some of-the pressure
from the transmiss.ion, ‘so you can pull
the
shifi lever out of P (Park).
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Winter Driving
Here are some tips for winter driving:
Have your Corvette in good shape for
winter.
Be sure your engine coolant
mix is correct.
Snow tires can help in loose snow,
but they may give you less traction on
ice than regular tires. If you do not
expect to be driving
in deep snow, but
may have
to travel over ice, you may
not want to switch to
snow tires at .all.
YOU may want to put winter
emergency supplies in your vehicle.
Include
an ice scraper, a small brush or
broom, a supply of windshield washer
fluid, a rag, some winter outer clothing,
a small shovel, a flashlight, .a red cloth,
and a couple of reflective warning
triangles. And, if-you will be driving
under severe conditions,
include a small
bag of sand, a piece of old carpet or a
couple of burlap bags to help provide
traction. Be sure you properly secure
these items in your vehicle.

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Engine Overheating
Y0.u will find an engine coolant
temperature gage. on. the instrument
cluster and a low coolant warning light
on the Drives In€orrnation Centkr.
Ifsteamis

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Cooling System
When you decide it% safe to lift the
hood, heri’s.what you’ll see-:
(A) Coolant.recovery tank
(B) Coolant-high fillreservoir with
(C) Electric engine fans
pressure c~p
If the caulant inside the csolaht
recovery tank is boiling, don’t do;
anything else until it cuols dam.
When it is cwl, rtmove- the .coolant
reqvery tank cap and I-ook at - the
dipstick. The
Coolant level should be at
or above-COLD.
If it isn”t, you may have a leak in the
radiator hoses, heater hoses, radiator,
water pmp, vapor vent pipes or hoses
or coolant pump.

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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.
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