2018 CHEVROLET CORVETTE C7 coolant temperature

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 3/29/17
232 Vehicle Care
Cooling System (Engine)
The cooling system allows the
engine to maintain the correct
working temperature.
LT1 Engine (without Dry SumpEngine Oil Tank)
1. Coolant Surge Tank withPressure Cap
2. Engine Cooling Fan (Out of View)
LT1 Engine (with Dry Sump
Engine Oil Tank)
1. Coolant Surge Tank withPressure Cap
2. Engine Cooling Fan (Out of View)
LT4 Engine (with Dry Sump
Engine Oil Tank)
1. Coolant Surge Tank withPressure Cap
2. Engine Cooling Fan (Out of View)
{Warning
An underhood electric fan can
start up even when the engine is
not running and can cause injury.
Keep hands, clothing, and tools
away from any underhood
electric fan.

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 3/29/17
Vehicle Care 233
{Warning
Do not touch heater or radiator
hoses, or other engine parts.
They can be very hot and can
burn you. Do not run the engine if
there is a leak; all coolant could
leak out. That could cause an
engine fire and can burn you. Fix
any leak before driving the
vehicle.
Engine Coolant
The cooling system in the vehicle is
filled with DEX-COOL engine
coolant. SeeRecommended Fluids
and Lubricants 0308. The fluid
requires changing at certain
intervals. See Maintenance
Schedule 0299.
The following explains the cooling
system and how to check and add
coolant when it is low. If there is a
problem with engine overheating,
see Engine Overheating 0236.
What to Use
{Warning
Plain water, or other liquids such
as alcohol, can boil before the
proper coolant mixture will. With
plain water or the wrong mixture,
the engine could get too hot but
there would not be an overheat
warning. The engine could catch
fire and you or others could be
burned.
Use a mixture of 40% DEX-COOL
coolant and 60% clean, drinkable
water. If using this mixture, nothing
else needs to be added. This
mixture:
. Gives freezing protection down
to−28 °C (−18 °F), outside
temperature.
. Gives boiling protection up to
129 °C (265 °F), engine
temperature.
. Protects against rust and
corrosion.
. Will not damage aluminum parts. .
Helps keep the proper engine
temperature.Caution
Do not use anything other than a
mix of DEX-COOL coolant that
meets GM Standard
GMW3420 and clean, drinkable
water. Anything else can cause
damage to the vehicle’ s engine
cooling system and vehicle, which
would not be covered by the
vehicle warranty.
Never dispose of engine coolant by
putting it in the trash, pouring it on
the ground, or into sewers, streams,
or bodies of water. Have the coolant
changed by an authorized service
center, familiar with legal
requirements regarding used
coolant disposal. This will help
protect the environment and your
health.

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 3/29/17
234 Vehicle Care
If ambient temperatures are
anticipated below−28 °C (−18 °F),
make sure a proper mixture ratio of
50% DEX-COOL coolant and 50%
clean, drinkable water is used.
Checking Coolant
The vehicle must be on a level
surface when checking the coolant
level.
Check to see if coolant is visible in
the coolant surge tank. If the coolant
inside the coolant surge tank is
boiling, do not do anything else until
it cools down. If coolant is visible
but the coolant level is not at or
above the cold fill line, add a
mixture of 40% DEX-COOL coolant
and 60% clean, drinkable water at
the coolant recovery tank, but be
sure the cooling system is cool
before this is done. See Engine
Overheating 0236.
The engine coolant surge tank is
toward the rear of the engine
compartment on the passenger side
of the vehicle. See Engine
Compartment Overview 0217. When the engine is cold, the coolant
level should be at the cold fill line on
the coolant surge tank.
When the engine is hot, the level
could be higher than the cold fill
line. If the coolant is below the cold
fill line when the engine is hot, there
could be a leak in the cooling
system.
If the coolant is low, add the coolant
or take the vehicle to your dealer for
service.
How to Add Coolant to the
Coolant Surge Tank
{Warning
Spilling coolant on hot engine
parts can burn you. Coolant
contains ethylene glycol and it will
burn if the engine parts are hot
enough.
{Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure
cap, even a little, can cause them
to come out at high speed and
you could be burned. Never turn
the cap when the cooling system,
including the pressure cap, is hot.
Wait for the cooling system and
pressure cap to cool.
If coolant is needed, add the proper
DEX-COOL coolant mixture directly
to the surge tank, but be sure the
cooling system is cool before this
is done.

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 3/29/17
236 Vehicle Care
To remove the aero panel and
bracket:
Stingray Shown, Grand Sport andZ06 Similar
1. Press up on the two indents at the bottom and lift the aero
panel off the bracket.
Stingray Shown, Grand Sport and
Z06 Similar
2. Unscrew the two fasteners that secure the bracket.
3. Gently pull the bracket away from the grille.
To replace the bracket and aero
panel: 1. Position the bracket over the grille.
2. Secure the bracket by pushing the two fasteners into place.
3. Snap the aero panel into place.
Engine Overheating
The vehicle has several indicators
to warn of engine overheating.
There is an engine coolant
temperature gauge on the
instrument cluster. See Engine
Coolant Temperature Gauge 0106.
The vehicle may also display a
message on the Driver Information
Center (DIC).
If the decision is made not to lift the
hood but to get service help right
away, see Roadside Assistance
Program 0320.
If the decision is made to lift the
hood, make sure the vehicle is
parked on a level surface.
Then check to see if the engine
cooling fan is running. If the engine
is overheating, the fan should be
running. If it is not, do not continue
to run the engine, and have the
vehicle serviced.

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 3/29/17
Vehicle Care 237
Caution
Do not run the engine if there is a
leak in the engine cooling system.
This can cause a loss of all
coolant and can damage the
system and vehicle. Have any
leaks fixed right away.
If Steam Is Coming from the
Engine
{Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure
cap, even a little, can cause them
to come out at high speed and
you could be burned. Never turn
the cap when the cooling system,
including the pressure cap, is hot.
Wait for the cooling system and
pressure cap to cool.
If No Steam Is Coming from
the Engine
If an engine overheat warning is
displayed but no steam can be seen
or heard, the problem may not be
too serious. Sometimes the engine
can get a little too hot when the
vehicle:
.Climbs a long hill on a hot day.
. Stops after high-speed driving.
. Idles for long periods in traffic.
If the overheat warning is displayed
with no sign of steam: 1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and to the
highest fan speed. Open the
windows as necessary.
3. When it is safe to do so, pull off the road, shift to P (Park) or
N (Neutral), and let the
engine idle.
If the temperature overheat gauge is
no longer in the shaded area or an
overheat warning no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly for about 10 minutes. Keep a safe
vehicle distance from the vehicle in
front. If the warning does not come
back on, continue to drive normally
and have the cooling system
checked for proper fill and function.
If the warning continues, pull over,
stop, and park the vehicle
right away.
If there is no sign of steam, idle the
engine for three minutes while
parked. If the warning is still
displayed, turn off the engine until it
cools down.
Washer Fluid
What to Use
When the vehicle needs windshield
washer fluid, be sure to read the
manufacturer instructions before
use. If the vehicle will be operating
in an area where the temperature
may fall below freezing, use a fluid
that has sufficient protection against
freezing.

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 4/5/17
344 Index
ConnectionsOnStar . . . . . . . . . . . . . . . . . . . . . . . 333
Control Traction and ElectronicStability . . . . . . . . . . . . . . . . . . . . . 192
Control of a Vehicle . . . . . . . . . . . . . 155
Convenience Net . . . . . . . . . . . . . . . . 93
Convertible Top . . . . . . . . . . . . . . . . . . 50
Convex Mirrors . . . . . . . . . . . . . . . . . . 43
Coolant Engine Temperature Gauge . . 106
Engine Temperature
Warning Light . . . . . . . . . . . . . . . .114
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . 147
Cooling System . . . . . . . . . . . . 232, 235
Courtesy Lamps . . . . . . . . . . . . . . . . 139
Courtesy Transportation Program . . . . . . . . . . . . . . . . . . . . . . . 322
Cover Cargo . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Cruise Control . . . . . . . . . . . . . . . . . . 201
Light . . . . . . . . . . . . . . . . . . . . . . . . . . .116
Cupholders . . . . . . . . . . . . . . . . . . . . . . 91
Customer Assistance . . . . . . . . . . . 319 Offices . . . . . . . . . . . . . . . . . . . . . . . . 318
Text Telephone (TTY)
Users . . . . . . . . . . . . . . . . . . . . . . . 319 Customer Information
Service Publications
Ordering Information . . . . . . . . 325
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . 316
D
Damage Repair, Collision . . . . . . . 323
Danger, Warning, and Caution . . . . 2
Data CollectionInfotainment System . . . . . . . . . . 329
OnStar . . . . . . . . . . . . . . . . . . . . . . . 329
Data Recorder Performance . . . . . . . . . . . . . . . . . . 141
Data Recorders, Event . . . . . . . . . 328
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . 136
Defensive Driving . . . . . . . . . . . . . . . 154
Delayed Locking . . . . . . . . . . . . . . . . . 36
Diagnostics OnStar . . . . . . . . . . . . . . . . . . . . . . . 335
Differential, Limited-Slip . . . . . . . . 200
Distracted Driving . . . . . . . . . . . . . . . 154
Door Ajar Light . . . . . . . . . . . . . . . . . . . . . .116
Delayed Locking . . . . . . . . . . . . . . . . 36
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Power Locks . . . . . . . . . . . . . . . . . . . . 36
Drive Belt Routing, Engine . . . . . . 315 Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . . 116
Driver Mode Control . . . . . . . . . . . . 194
Driving Competitive . . . . . . . . . . . . . . . . . . . 197
Defensive . . . . . . . . . . . . . . . . . . . . . 154
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . 155
For Better Fuel Economy . . . . . . . 24
Hill and Mountain Roads . . . . . . 168
If the Vehicle is Stuck . . . . . . . . . 170
Loss of Control . . . . . . . . . . . . . . . 156
Off-Road Recovery . . . . . . . . . . . 156
Track Events andCompetitive . . . . . . . . . . . . . . . . . 157
Vehicle Load Limits . . . . . . . . . . . 170
Wet Roads . . . . . . . . . . . . . . . . . . . 167
Winter . . . . . . . . . . . . . . . . . . . . . . . . 168
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . 147
E
Electric Parking Brake . . . . . . . . . . 190
Electric Parking Brake Light . . . . 112
Electrical Equipment,Add-On . . . . . . . . . . . . . . . . . . . . . . . 210
Electrical System
Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 247
Fuses . . . . . . . . . . . . . . . . . . . . . . . . 247

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 4/5/17
Index 345
Electrical System (cont'd)Overload . . . . . . . . . . . . . . . . . . . . . 247
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 251
Electronic Stability Control (ESC) Off Light . . . . . . . . . . . . . . . . 113
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . 332
Engine
Air Cleaner/Filter . . . . . . . . . . . . . 229
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . 109
Compartment Overview . . . . . . . 217
Coolant Temperature Gauge . . . . . . . . . . . . . . . . . . . . . . 106
Coolant Temperature Warning Light . . . . . . . . . . . . . . . .114
Cooling System . . . . . . . . . . 232, 235
Drive Belt Routing . . . . . . . . . . . . 315
Exhaust . . . . . . . . . . . . . . . . . . . . . . 181
Oil Life System . . . . . . . . . . . . . . . 227
Oil Pressure Light . . . . . . . . . . . . .115
Overheating . . . . . . . . . . . . . . . . . . 236
Power Messages . . . . . . . . . . . . . 123
Running While Parked . . . . . . . . 181
Starting . . . . . . . . . . . . . . . . . . . . . . . 177
Entry Lighting . . . . . . . . . . . . . . . . . . . 140
Event Data Recorders . . . . . . . . . . 328 Exit Lighting . . . . . . . . . . . . . . . . . . . . 140
Extended Parking . . . . . . . . . . . . . . . 180
Extender, Seat Belt . . . . . . . . . . . . . . 68
Exterior Lamp Controls . . . . . . . . . 135
Exterior Lamps Off Reminder . . . 136
Exterior Lighting Battery
Saver . . . . . . . . . . . . . . . . . . . . . . . . . 140
F
Features
Memory . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filter,
Engine Air Cleaner . . . . . . . . . . . 229
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 136
Flashers, Hazard Warning . . . . . . 138
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 275
Floor Mats . . . . . . . . . . . . . . . . . . . . . . 297
Fluid Automatic Transmission . . . . . . 228
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 239
Washer . . . . . . . . . . . . . . . . . . . . . . . 237
Folding Mirrors . . . . . . . . . . . . . . . . . . 43
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . 326
Front Air Dam . . . . . . . . . . . . . . . . . . 174
Front Seats Heated and Ventilated . . . . . . . . . . 62
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206 Additives . . . . . . . . . . . . . . . . . . . . . 207 Fuel (cont'd)
Economy Driving . . . . . . . . . . . . . . . 24
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . 209
Filling the Tank . . . . . . . . . . . . . . . 207
Foreign Countries . . . . . . . . . . . . 207
Gauge . . . . . . . . . . . . . . . . . . . . . . . . 105
Low Fuel Warning Light . . . . . . . .115
Management, Active . . . . . . . . . . 180
Requirements, California . . . . . 207
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . 247 Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 247
Rear Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 251
G
Garage Door Opener . . . . . . . . . . . 131Programming . . . . . . . . . . . . . . . . . 131
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . 244
Gauges Boost . . . . . . . . . . . . . . . . . . . . . . . . . 106
Engine CoolantTemperature . . . . . . . . . . . . . . . . 106
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Odometer . . . . . . . . . . . . . . . . . . . . . 104
Speedometer . . . . . . . . . . . . . . . . . 104
Tachometer . . . . . . . . . . . . . . . . . . . 104
Trip Odometer . . . . . . . . . . . . . . . . 104

Chevrolet Corvette Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11374030) - 2018 - crc - 4/5/17
Index 347
Lifting the Vehicle, Tires . . . . . . . . 213
LightingEntry . . . . . . . . . . . . . . . . . . . . . . . . . 140
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Illumination Control . . . . . . . . . . . 139
LED . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Lights
Airbag Readiness . . . . . . . . . . . . . 108
Antilock Brake System(ABS) Warning . . . . . . . . . . . . . . .112
Brake System Warning . . . . . . . . 111
Charging System . . . . . . . . . . . . . 109
Check Engine (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 109
Cruise Control . . . . . . . . . . . . . . . . .116
Door Ajar . . . . . . . . . . . . . . . . . . . . . .116
Electric Parking Brake . . . . . . . . .112
Electronic Stability Control (ESC), Off . . . . . . . . . . . . . . . . . . . .113
Engine Coolant Temperature Warning . . . . . . . .114
Engine Oil Pressure . . . . . . . . . . .115
Flash-to-Pass . . . . . . . . . . . . . . . . . 136
High-Beam On . . . . . . . . . . . . . . . . .116
High/Low Beam Changer . . . . . 136
Low Fuel Warning . . . . . . . . . . . . .115
Seat Belt Reminders . . . . . . . . . . 107
Security . . . . . . . . . . . . . . . . . . . . . . .115 Lights (cont'd)
Service Electric Parking
Brake . . . . . . . . . . . . . . . . . . . . . . . .112
Tire Pressure . . . . . . . . . . . . . . . . . .114
Traction Off . . . . . . . . . . . . . . . . . . . .113
Limited-Slip Differential . . . . . . . . . 200
Locks Automatic Door . . . . . . . . . . . . . . . . . 37
Delayed Locking . . . . . . . . . . . . . . . . 36
Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Lockout Protection . . . . . . . . . . . . . . 37
Power Door . . . . . . . . . . . . . . . . . . . . . 36
Loss of Control . . . . . . . . . . . . . . . . . 156
Low Fuel Warning Light . . . . . . . . . 115
Low-Profile Tires . . . . . . . . . . . . . . . . 256
Lower Anchors and Tethers for Children (LATCH
System) . . . . . . . . . . . . . . . . . . . . . . . . 86
Lumbar Adjustment . . . . . . . . . . . . . . 57 Front Seats . . . . . . . . . . . . . . . . . . . . . 57
M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . . .311
Maintenance and Care Additional . . . . . . . . . . . . . . . . . . . . . 305
Maintenance Schedule . . . . . . . . . 299 Maintenance Schedule (cont'd)
Recommended Fluids and
Lubricants . . . . . . . . . . . . . . . . . . . 308
Malfunction Indicator Lamp . . . . . 109
Manual Mode . . . . . . . . . . . . . . . . . . . 183
Manual Transmission . . . . . . . . . . . 186
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Matching Active Rev . . . . . . . . . . . . . . . . . . . . 188
Memory Features . . . . . . . . . . . . . . . . 12
Memory Seats . . . . . . . . . . . . . . . . . . . 58
Messages Engine Power . . . . . . . . . . . . . . . . 123
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 123
Vehicle Speed . . . . . . . . . . . . . . . . 124
Mirrors Automatic Dimming . . . . . . . . . . . . . 43
Automatic DimmingRearview . . . . . . . . . . . . . . . . . . . . . . 44
Convex . . . . . . . . . . . . . . . . . . . . . . . . . 43
Folding . . . . . . . . . . . . . . . . . . . . . . . . . 43
Heated . . . . . . . . . . . . . . . . . . . . . . . . . 43
Manual Rearview . . . . . . . . . . . . . . . 44
Power . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Tilt in Reverse . . . . . . . . . . . . . . . . . . 43
Mirrors, Interior Rearview . . . . . . . . 44