2018 CHEVROLET IMPALA engine overheat

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
226 Vehicle Care
2.5L L4 Engine
1. Engine Cooling Fans (Outof View)
2. Coolant Surge Tank and Pressure Cap
3.6L V6 Engine
1. Engine Cooling Fans (Outof View)
2. Coolant Surge Tank and Pressure Cap
{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.
{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. This coolant is designed to
remain in the vehicle for 5 years or
240 000 km (150,000 mi), whichever
occurs first.
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 0229.

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
Vehicle Care 227
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 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant. If using this mixture,
nothing else needs to be added.
This mixture:
. Gives freezing protection down
to−37 °C (−34 °F), outside
temperature.
. Gives boiling protection up to
129 °C (265 °F), engine
temperature.
. Protects against rust and
corrosion. .
Will not damage aluminum parts.
. Help 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 engine cooling
system and the 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.
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 mark
pointed to, add a 50/50 mixture of
clean drinkable water and
DEX-COOL coolant.

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
228 Vehicle Care
Be sure the cooling system is cool
before this is done.
If no coolant is visible in the coolant
surge tank, add coolant as follows:
How to Add Coolant to the
Coolant Surge Tank
If no problem is found, check to see
if coolant is visible in the coolant
surge tank. If coolant is visible but
the coolant level is not at the
indicated level mark, add a
50/50 mixture of clean, drinkable
water and DEX-COOL coolant at the
coolant surge tank, but be sure the
cooling system, including the
coolant surge tank pressure cap, is
cool before you do it.
{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.
Caution
Failure to follow the specific
coolant fill procedure could cause
the engine to overheat and could
cause system damage. If coolant
is not visible in the surge tank,
contact your dealer.
1. Remove the coolant surge tankpressure cap when the cooling
system, including the coolant
surge tank pressure cap and
upper radiator hose, is no
longer hot.
Turn the pressure cap slowly
counterclockwise about
one-quarter of a turn. If you
hear a hiss, wait for that to
stop. This will allow any
pressure still left to be vented
out the discharge hose.
2. Keep turning the pressure cap slowly and remove it.
3. Fill the coolant surge tank with the proper mixture to the
indicated level mark.
4. With the coolant surge tank pressure cap off, start the
engine and let it run until you

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
Vehicle Care 229
can feel the upper radiator
hose getting hot. Watch out for
the engine cooling fans.
By this time, the coolant level
inside the coolant surge tank
may be lower. If the level is
lower, add more of the proper
mixture to the coolant surge
tank until the level reaches the
indicated level mark.
5. Replace the pressure cap tightly.
6. Verify coolant level after the engine is shut off and the
coolant is cold. If necessary,
repeat coolant fill procedure
Steps 1–6.
If the coolant still is not at the
proper level when the system
cools down again, see your
dealer.Caution
If the pressure cap is not tightly
installed, coolant loss and engine
damage may occur. Be sure the
cap is properly and tightly
secured.
Engine Overheating
There is a coolant temperature
gauge on the instrument cluster that
indicates an overheated engine
condition. See Engine Coolant
Temperature Gauge 0115.
If the decision is made not to lift the
hood when this warning appears,
get service help right away. See
Roadside Assistance Program
0 311.
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 fans are running. If the
engine is overheating, the fans should be running. If not, do not
continue to run the engine and have
the vehicle serviced.
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 Compartment
{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.

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
230 Vehicle Care
SeeOverheated Engine Protection
Operating Mode 0230 for
information on driving to a safe
place in an emergency.
If No Steam Is Coming from
the Engine Compartment
If an engine overheat warning is
displayed but no steam can be seen
or heard, the problem might 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.
. Tows a trailer.
If the overheat warning displays 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 coolant temperature gauge is
no longer in the overheat zone, 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. Also, see Overheated
Engine Protection Operating Mode
0 230.
Overheated Engine
Protection
Operating Mode
This emergency operating mode
allows the vehicle to be driven to a
safe place in an emergency
situation. If an overheated engine
condition exists, an overheat
protection mode which alternates
firing groups of cylinders helps
prevent engine damage. In this
mode, there is significant loss in
power and engine performance.
The engine coolant temperature
gauge indicates if an overheat
condition exists. Driving extended
distances and/or towing a trailer in
the overheat protection mode
should be avoided.
Washer Fluid
What to Use
When windshield washer fluid is
needed, be sure to read the
manufacturer's instructions before
use. If operating the vehicle in an
area where the temperature may fall

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
336 Index
Dual Automatic ClimateControl System . . . . . . . . . . . . . . . . 150
E
E85 or FlexFuel . . . . . . . . . . . . . . . . 203
Electric Parking Brake . . . . . . . . . . 178
Electric Parking Brake Light . . . . 120
Electrical Equipment,
Add-On . . . . . . . . . . . . . . . . . . . . . . . 211
Electrical System Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 243
Fuses and Circuit Breakers . . . 243
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 246
Overload . . . . . . . . . . . . . . . . . . . . . 242
Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . 322
Engine Air Cleaner/Filter . . . . . . . . . . . . . 224
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . .118
Compartment Overview . . . . . . . 217
Coolant Temperature Gauge . . . . . . . . . . . . . . . . . . . . . . .115
Cooling System . . . . . . . . . . . . . . . 225
Drive Belt Routing . . . . . . . . . . . . 306
Exhaust . . . . . . . . . . . . . . . . . . . . . . 174 Engine (cont'd)
Heater . . . . . . . . . . . . . . . . . . . . . . . . 171
Oil Life System . . . . . . . . . . . . . . . 222
Oil Pressure Light . . . . . . . . . . . . 123
Overheated Protection
Operating Mode . . . . . . . . . . . . . 230
Overheating . . . . . . . . . . . . . . . . . . 229
Power Messages . . . . . . . . . . . . . 128
Running While Parked . . . . . . . . 174
Starting . . . . . . . . . . . . . . . . . . . . . . . 169
Entry Lighting . . . . . . . . . . . . . . . . . . . 144
Equipment, Towing . . . . . . . . . . . . . 210
Event Data Recorders . . . . . . . . . . 319
Exit Lighting . . . . . . . . . . . . . . . . . . . . 144
Extended Parking . . . . . . . . . . . . . . . 174
Extender, Seat Belt . . . . . . . . . . . . . . 67
Exterior Lamp Controls . . . . . . . . . 139
Exterior Lamps Off Reminder . . . 140
Exterior Lighting Battery Saver . . . . . . . . . . . . . . . . . . . . . . . . . 145
F
FeaturesMemory . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filter, Engine Air Cleaner . . . . . . . . . . . 224
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 140
Flashers, Hazard Warning . . . . . . 141 Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 269
Changing . . . . . . . . . . . . . . . . . . . . . 270
FlexFuel E85 . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Floor Mats . . . . . . . . . . . . . . . . . . . . . . 289
Fluid Automatic Transmission . . . . . . 223
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 232
Washer . . . . . . . . . . . . . . . . . . . . . . . 230
Folding Mirrors . . . . . . . . . . . . . . . . . . 44
Forward Automatic Braking . . . . . 197
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . 195
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . 317
Front Seats
Adjustment . . . . . . . . . . . . . . . . . . . . . 53
Heated and Ventilated . . . . . . . . . . 59
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Additives . . . . . . . . . . . . . . . . . . . . . 203
Economy Driving . . . . . . . . . . . . . . . 26
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . 206
Filling the Tank . . . . . . . . . . . . . . . 204
Foreign Countries . . . . . . . . . . . . 203
Gauge . . . . . . . . . . . . . . . . . . . . . . . . .114
Low Fuel Warning Light . . . . . . . 123
Requirements, California . . . . . 202

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-11348316) -
2018 - CRC - 8/22/17
Index 339
M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . . 303
Maintenance and Care Additional . . . . . . . . . . . . . . . . . . . . . 298
Maintenance Schedule . . . . . . . . . 293 Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . 301
Malfunction Indicator Lamp . . . . . 118
Manual Mode . . . . . . . . . . . . . . . . . . . 177
Memory Features . . . . . . . . . . . . . . . . 12
Memory Seats . . . . . . . . . . . . . . . . . . . 56
Messages Engine Power . . . . . . . . . . . . . . . . 128
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 127
Vehicle Speed . . . . . . . . . . . . . . . . 128
Mirrors Automatic Dimming . . . . . . . . . . . . . 44
Automatic DimmingRearview . . . . . . . . . . . . . . . . . . . . . . 45
Convex . . . . . . . . . . . . . . . . . . . . . . . . . 43
Folding . . . . . . . . . . . . . . . . . . . . . . . . . 44
Heated . . . . . . . . . . . . . . . . . . . . . . . . . 44
Manual Rearview . . . . . . . . . . . . . . . 45
Power . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Tilt in Reverse . . . . . . . . . . . . . . . . . . 44
Mirrors, Interior Rearview . . . . . . . . 45 Monitor System, Tire
Pressure . . . . . . . . . . . . . . . . . . . . . . 258
N
Navigation
OnStar . . . . . . . . . . . . . . . . . . . . . . . 323
Net, Convenience . . . . . . . . . . . . . . 102
New Vehicle Break-In . . . . . . . . . . . 167
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . 113
Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
Off-Road
Recovery . . . . . . . . . . . . . . . . . . . . . 159
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . 220
Engine Oil Life System . . . . . . . 222
Pressure Light . . . . . . . . . . . . . . . . 123
Older Children, Restraints . . . . . . . 81
Online Owner Center . . . . . . . . . . . 310
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . 320
OnStar Additional Information . . . . . . . . . . . . . . . . . . . . 327
OnStar Connections . . . . . . . . . . . . 324
OnStar Diagnostics . . . . . . . . . . . . . 326
OnStar Emergency . . . . . . . . . . . . . 322
OnStar Navigation . . . . . . . . . . . . . . 323
OnStar Overview . . . . . . . . . . . . . . . 321
OnStar Security . . . . . . . . . . . . . . . . 323 Operating Mode
Overheated Engine
Protection . . . . . . . . . . . . . . . . . . . 230
Ordering Service Publications . . . . . . . . . . 316
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . 106
Overheated Engine Protection Operating Mode . . . . 230
Overheating, Engine . . . . . . . . . . . . 229
P
Park Shifting Into . . . . . . . . . . . . . . . . . . . 172
Shifting Out of . . . . . . . . . . . . . . . . 173
Parking Brake and P (Park)
Mechanism Check . . . . . . . . . . 235
Extended . . . . . . . . . . . . . . . . . . . . . 174
Over Things That Burn . . . . . . . 173
Parking Assist . . . . . . . . . . . . . . . . . . 192
Parking or Backing
Assistance Systems . . . . . . . . . . 192
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . 116
Passenger Compartment Air
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Passenger Sensing System . . . . . 74