cooling CHEVROLET CORVETTE 1993 4.G Owners Manual

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.Driving. your vehicle with low oil
pressure can cause extensive engine
-damage.
II D4
This gage shows your oil temperature in
degrees Fahrenheit +
It's normal fop the oil temperature to
vary, depending on the type of driving
you do and the weather conditions.. If
"you drive for a long time, such as on a
trip, the gage will show a higher reading-
than
if you had driven for only a short
time. And if it's hot -outside, the-reading
will be higher than if it were cold outside.
If your oil temperature approaches the
shaded area and stays there for some
time; your oil temperature is too high.
Check
the engine oil levei and bring
your vehicle in for service.
You should
also check the engine coolant temperature.
If your engine is to.0 hot, see the.Index
under Engine Cooling System.
For accurate gage measurements refer
to the GAUGES button on the Trip
Monitor (see the
Index under Trip
Monitor).

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Y301 ! I
CZimate Coratrol
The air conditioner and heater work
best if you keep your windows closed
while
using them. Your vehicle also has
the flow-through ventilation system
described
later in this section.
OFF: Press this button to turn the
system
off. Press any function button to
turn the system on.
Temperature Control Lever: This lever
regulates the
temperature of the air
coming through the system.
Fan: The two fan buttons allow you to
select the force of air you want.
Press r3f to lower the fan speed, or
A to raise it.
Air Condifioning
On very hot days, open the windows
long enough to let hot inside air escape.
Your
system has three air conditioning
settings:
& (Maximum A/C): Use for
maximum
cooling or quick cool-down
on very hot days.
This setting will not
operate when outside temperatures are
below
40°F (5°C).
-(Normal A/C) : Use for normal
’ caoling on hot days. This setting
brings in outside air, cools it, and
directs it through the instrument panel
outlets.
outside air,
cools it, and directs it in two
ways-through
the instrument panel
outlets, as well 9s-t.bough the heater
ducts.
(Bi-Level): This setting brings in
For each air conditioning setting, adjust
the temperature control lever and fan
speed as desired.

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... I..
1. 140
Automutic Ekctronic
Climate Control (OPTION)
With this system, you can control the
ventilation, heating
and air conditioning
in your vehicle, or you can use the
automatic setting.
Your vehicle also has
the flow-through ventilation system
described later
in this section.
The digital screen displays the outside
temperature, the inside temperature
setting, and the fan speed.
If the inside
temperature is changed,
or if the system
is changed from
OFF to any mode, the
inside temperature setting will be
displayed for several seconds before the
outside temperature is again displayed.
The
air conditioner compressor operates
in all air conditioning positions, and in
(@ (Defrost) when the outside
temperature is above freezing.
When
the air conditioner is on, you may
sometimes notice slight changes in your
vehicle's engine speed and power. This
is normal, because the Automatic
EIectronic Climate Control system
is
designed to cycle the compressor on
and off to keep the desired cooling and
to
help your vehicle's fuel economy.
TEMP SET: This control sets the
interior temperature you want. Press
V to lower the inside temperature
setting; press
A to raise the setting.
The temperature
you set will be
displayed on the digital screen.
Once you set the temperature you want,
the system will try to maintain this temperature,
whether
you are using the
heating
or the cooling controls.
However, if you set the temperature for
60°F (16°C) or 90°F (3Z°C), the fan will
stay on 3p udess you select a
different speed.
Your Automatic Electronic Climate
Control system
has three sensors. The
sun load sensor on top of the dashboard
detects increased interior temperature
caused by sunlight.
To keep you
comfortable, it reduces the interior
temperature
by as much as 5°F (3°C)
below the setting on the digital screen.
The outside air temperature sensor,
located on the right
side of the upper
radiator support
in the grille opening,
reads the outside temperature.
This is
what you usually see on the display.

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P
To Reset Your System:
1. Turn your ignition.lrey to Off or
Lock.
2. Pull the Courtesy Lights Fuse and
Radio Fuse .out of the- main fuse
panel for
one minute.
3. Put-the fuses back in and start your
vehicle. Your system shuuld be
working.
If you still have a problem,
see your deder,
.For
fuse location, see the Index under
Fuses E. CircuitBreakers and Fuse
.Panel.
Directional Controls
When the €allowing buttons are pressed,
an indicator light.
will glow above .the
button and the fan speed will go to
AUTO 3f unless you select a dBerent
speed. When the system is'changed
€rum
OFF tu any mode, the inside
temperature setting is displayed for
several seconds before the .outside
temperature is again displayed.
& (Maximum A/C): Use for
maximum cooling
or quick cool-down
on very hot days..
This setting will not
operate when outside temperatures are
below
40°F (5°C) I
-2 (Bi-Level): This setting lets air
inte the vehicle only through the
.heater and air conditioner outlets and
brings.the temperature
to the range
you choose. It controls the fan blower
speed by using t-he input signals.
Bi-Level al.so
defogs the side windows,
You can. override the,fan blower speed
by using
the V and A buttons.
a(Vent): In this setting, the
compressor
will not. mn. The-system
will adju-st
to the temperature you
choose, but it cannot cool the vehicle
to a temperature colder than the
outside air temperature, This setting

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F"
Hin and Mounfain Roads
Driving on steep hills or mountains is
dif€erent fram driving in flat or rolling
terrain. If you drive regularly in steep
country,
or if you're planning to visit
there, here are -some tips that can make
your trips safer and.more enjoyable.
Keep your vehicle in good shape. Check
all fluid levels and also the brakes, tires,
cooling system and transmission. These
parts can work hard on mountain roads.
Know how to go down hills. The most
important thing to how is this: Let
your engine do. some of the slowing
'down. Don't make your brakes do it
all. Shift to a lower gear when you go
down .a steep or long hill. That way,
you will slow down without excessive
use of your brake-s.
Know how to go uphill. You may
want to shift dawn to a lower gear.
The lower gems help cool your engine
and transmission, and you can clin-ib
the *f hiU better.
Stay in your own lane when driving
on two-lane roads in hills or
mountains. Don't swing wide .or cut-
across. the .center of the road. Drive at
speeds that-let-you stay 'in your own
lae. That way, you won't be
surprised by,a vehicle- coming toward
you
in the same lane.
* It takes longer to pass another vehicle-
when you're going uphill. You'll want
to leave extra room to pass. If a
vehicle is passing you and doesn't
have enough room, slow down to
make it easier for the other vehicle to
get by.

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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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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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How to Add Coo/ant to the Coolant
Recovery Tank (CONT.)
CAUTlON
Steam and scalding liquids
from a hot cooling system
can blow out and
burn you badly.
They are under pressure, and if you
turn the.coolant high fill reservoir
pressure cap-even a little-they
can come out at high speed. Never
turn the cap when the cooling
system, including the coolant
high
fill reservoir pressure cap, is hot.
Wait for the cooling system and
coolant high fill reservoir pressure
cap to cool if you ever have to turn
the pressure cap.
How fa Add Coolant to the Coolant
High FM Reservoir-LT1 On/y 1. You 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 cap slowly to the left until it
first
stops. (Don't press down while
turning the pressure cap.)
If you hear a hiss, wait for that to stop. A
hiss means there is still some pressure
left.
.n
- ,.

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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.

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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.