1999 CHEVROLET CORVETTE engine overheat

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5-18
If a Tire Goes Flat
Your Chevrolet has neither a spare tire nor tire changing
equipment, because it was built with Goodyear
Extended Mobility Tires (EMT). See ªExtended
Mobility Tiresº in the Index.
CAUTION:
Because your vehicle has no spare tire, no tire
changing equipment, and no provisions to store a
tire in the vehicle, special tools and procedures
are required if a tire needs to be serviced. If these
tools and procedures aren't used, you or others
could be injured and your vehicle could be
damaged. Always be sure the proper tools and
procedures, as described in the Chevrolet
Corvette Service Manual, are used.
To order a service manual, see ªService and Owner
Publicationsº in the Index.
If You're Stuck: In Sand, Mud,
Ice or Snow
In order to free your vehicle when it is stuck, you will
need to spin the wheels, but you don't want to spin your
wheels too fast. The method known as ªrockingº can
help you get out when you're stuck, but you must
use caution.
CAUTION:
If you let your tires spin at high speed, they can
explode, and you or others could be injured. And,
the transmission or other parts of the vehicle can
overheat. That could cause an engine
compartment fire or other damage. When you're
stuck, spin the wheels as little as possible. Don't
spin the wheels above 35 mph (55 km/h) as shown
on the speedometer.

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6-22 How to Check Lubricant
If the level is below the bottom of 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.
What to Use
To add lubricant when the level is low, use SAE 75W-90
Synthetic Gear Lubricant (GM Part No. 12378261) or
equivalent meeting GM Specification 9986115. To
completely refill after draining, add 4 ounces (118 ml)
of Limited
-Slip Differential Lubricant Additive
(GM Part No. 1052358) or equivalent. Then fill to
the bottom of the filler plug hole with the Synthetic
Gear Lubricant.
Surge Tank Pressure Cap
NOTICE:
The surge tank pressure cap is a 15 psi (105 kPa)
pressure
-type cap and must be tightly installed to
prevent coolant loss and possible engine damage
from overheating.
When you replace the surge tank pressure cap, a GM cap
is recommended.

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6-23
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a pre
-set temperature.
When you replace the thermostat, a GM thermostat
is recommended.
Engine Coolant
The cooling system in your vehicle is filled with
DEX
-COOL
engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
DEX
-COOL
extended life coolant.
The following explains your cooling system and how
to add coolant when it is low. If you have a problem
with engine overheating, see ªEngine Overheatingº in
the Index.A 50/50 mixture of clean, drinkable water and
DEX
-COOL
coolant will:

Give freezing protection down to
-34F (-37C).

Give boiling protection up to 265F (129C).

Protect against rust and corrosion.

Help keep the proper engine temperature.

Let the warning lights and gages work as
they should.
NOTICE:
When adding coolant, it is important that you
use only DEX
-COOL (silicate-free) coolant.
If coolant other than DEX-COOL is added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
-- at
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the
use of coolant other than DEX
-COOL is not
covered by your new vehicle warranty.

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6-24 What to Use
Use a mixture of one-half clean, drinkable water and
one
-half DEX-COOL
coolant which won't damage
aluminum parts. If you use this coolant mixture, you
don't need to add anything else.
CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mixture will. Your vehicle's coolant
warning system is set for the proper coolant
mixture. With plain water or the wrong mixture,
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 mixture of clean, drinkable water and
DEX
-COOL
coolant.
NOTICE:
If you use an improper coolant mixture, your
engine could overheat and be badly damaged.
The repair cost wouldn't be covered by your
warranty. Too much water in the mixture can
freeze and crack the engine, radiator, heater core
and other parts.
If you have to add coolant more than four times a year,
have your dealer check your cooling system.
NOTICE:
If you use the proper coolant, you don't have to
add extra inhibitors or additives which claim to
improve the system. These can be harmful.

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9-5
Electrical Equipment, Adding 2-24, 3-28, 6-63 . . . . . . . . . .
Electrical System 6-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Dual Climate Control System 3-4 . . . . . . . . . . . . . .
EMT 6-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory Belt 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Coolant 6-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner/Filter 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Coolant 6-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 5-13, 5-16, 6-23 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Heater 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Level Check 7-13 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Gage 2-82 . . . . . . . . . . . . . . . . . . . . .
Exhaust 2-16, 2-38, 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block 6-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identification 6-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Level Check 7-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pressure Gage 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overheated Engine Protection Operating Mode 5-8 . . . . . .
Overheating 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Curves 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Running While Parked 2-39 . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 6-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your 2-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Air Cleaner/Filter 6-16 . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kind to Use 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Level Check 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Life 2-97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Life Monitor, How to Reset 6-15 . . . . . . . . . . . . . . . . . . . . .
Scheduled Maintenance 7-6 . . . . . . . . . . . . . . . . . . . . . . . . . Used 6
-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When to Change 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil Life Monitor 6-15, 7-5 . . . . . . . . . . . . . . . . . . . . .
Engine Oil Scheduled Maintenance 7-6 . . . . . . . . . . . . . . . . . .
English/Metric Button 2-77 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ethanol 6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust, Engine 2-16, 2-38, 4-30 . . . . . . . . . . . . . . . . . . . . . .
Exit and Entry Lighting 2-53 . . . . . . . . . . . . . . . . . . . . . . . . . .
Express-Down Windows 2-41 . . . . . . . . . . . . . . . . . . . . . . . . .
Extended Mobility Tires 6-42 . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps 2-44, 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fabric Protection 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Control Buttons 3-2, 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature, Theft-Deterrent 2-17 . . . . . . . . . . . . . . . . . . . . . . . . .
Fiberglass Springs 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fifth Gear, Manual Transmission 2-31 . . . . . . . . . . . . . . . . . . .
Filling
A Portable Fuel Container 6
-9 . . . . . . . . . . . . . . . . . . . . . . .
Your Tank 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter, Air Cleaner 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish
Care 6
-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First Gear
Automatic Transmission 2
-29 . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission 2-30 . . . . . . . . . . . . . . . . . . . . . . . . . .
Fixed Mast Antenna 3-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flashers, Hazard Warning 5-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Flat Tire, What to Do 5-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Mats 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Capacities 6-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-8
Magnasteer
4-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnesium Wheel Finish 6-63 . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Record 7-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Schedule 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil 7-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Periodic Maintenance Inspections 7-17 . . . . . . . . . . . . . . . .
Recommended Fluids and Lubricants 7-19 . . . . . . . . . . . . .
Scheduled Maintenance Services 7-4 . . . . . . . . . . . . . . . . . .
Your Vehicle and the Environment 7-2 . . . . . . . . . . . . . . . .
Maintenance, Underbody 6-63 . . . . . . . . . . . . . . . . . . . . . . . . .
Malfunction Indicator Lamp 2-83 . . . . . . . . . . . . . . . . . . . . . .
Manual
Comfort Control System 3
-2 . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Filler Door Release Tab 6-7 . . . . . . . . . . . . . . . . . . . . .
Seat 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission
Check 7
-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downshifting 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One to Four Light 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting 2-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your Engine 2-23 . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Methanol 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mirrors 2-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview 2-54 . . . . . . . . . . . . . . . . . . . . .
Power/Heated Remote Control 2-55 . . . . . . . . . . . . . . . . . .
Visor Vanity 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MMT 6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mountain Roads 4-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multifunction Lever 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Neutral
Automatic Transmission 2-28 . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . .
New Vehicle Break-In 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Night Vision 4-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Maintenance Replacement Parts 6-76 . . . . . . . . . . . . .
Odometer 2-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-Road Recovery 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil, Engine 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
One to Four Light 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outlet, Accessory Power 2-60 . . . . . . . . . . . . . . . . . . . . . . . . .
Overdrive, Automatic Transmission 2-29 . . . . . . . . . . . . . . . .
Overheated Engine Protection Operating Mode 5-8 . . . . . . . .
Overheating Engine 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Owner Checks and Services 7-13 . . . . . . . . . . . . . . . . . . . . . . .
Owner Publications, Ordering 8-12 . . . . . . . . . . . . . . . . . . . . .
Paint Spotting, Chemical 6-63 . . . . . . . . . . . . . . . . . . . . . . . .
PARK (P)
Automatic Transmission 2
-27 . . . . . . . . . . . . . . . . . . . . . . .
Shifting Into 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting Out of 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking
At Night 2
-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake 2-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Mechanism Check 7-16 . . . . . . . . . . . . . . . . . . . . . . .
Lots 2-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Over Things That Burn 2-38 . . . . . . . . . . . . . . . . . . . . . . . .
Your Vehicle, Manual Transmission 2-37 . . . . . . . . . . . . . .
Passenger Position 1-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Passing 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .