2020 CHEVROLET IMPALA coolant temperature

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
210 Vehicle Care
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,
seeEngine Overheating 0212.
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
(Continued)
Caution (Continued)
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.

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
212 Vehicle Care
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
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 0100. If the decision is made not to lift the
hood when this warning appears,
get service help right away. See
Roadside Assistance Program
0
294.
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.

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
Vehicle Care 213
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.
See Overheated Engine Protection
Operating Mode 0213 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
0 213.
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

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
214 Vehicle Care
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
below freezing, use a fluid that has
sufficient protection against
freezing.
Adding Washer Fluid
Open the cap with the washer
symbol on it. Add washer fluid until
the tank is full. SeeEngine
Compartment Overview 0203 for
reservoir location.
Caution
. Do not use washer fluid that
contains any type of water
repellent coating. This can
cause the wiper blades to
chatter or skip.
. Do not use engine coolant
(antifreeze) in the
windshield washer. It can
damage the windshield
washer system and paint.
. Do not mix water with
ready-to-use washer fluid.
Water can cause the
solution to freeze and
damage the washer fluid
tank and other parts of the
washer system.
. When using concentrated
washer fluid, follow the
manufacturer instructions for
adding water.
. Fill the washer fluid tank
only three-quarters full when
it is very cold. This allows
(Continued)
Caution (Continued)
for fluid expansion if
freezing occurs, which could
damage the tank if it is
completely full.
Brakes
Disc brake pads have built-in wear
indicators that make a high-pitched
warning sound when the brake pads
are worn and new pads are needed.
The sound can come and go or can
be heard all the time when the
vehicle is moving, except when
applying the brake pedal firmly.
{Warning
The brake wear warning sound
means that soon the brakes will
not work well. That could lead to
a crash. When the brake wear
warning sound is heard, have the
vehicle serviced.

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
228 Vehicle Care
The vehicle may not be equipped
with all of the fuses, relays, and
features shown.Fuses Usage
1 Transmission control module battery
2 Engine control module battery / A/C Clutch
3 A/C clutch
4 Engine control module battery
5 Engine control module/Ignition
6 Front wiper
7 Engine control module ignition
8 Ignition coils –even
9 Ignition coils –odd
10 Engine control module Fuses Usage
11 Mass air flow sensor/ Intake air
temperature/Humidity/
Temperature intake air
pressure/Post
catalytic converter O2
sensors
12 Starter/Starter pinion
13 Transmission control module/Chassis
control module/
Ignition
14 Cabin coolant pump
17 Ventilated front seats/ Heated steering wheel
18 Battery disconnect unit
19 Aeroshutter
20 Transmission auxiliary pump
21 Rear power window
22 Sunroof
23 Adaptive cruise control Fuses Usage
24 Front power window
25 Retained accessory power
26 ABS pump
27 Electric parking brake
28 Rear defogger
29 Passive entry/Passive start
30 Canister vent solenoid
31 Heated seat –driver
32 LED Backlight Dimming Control/Left
headlamp low-beam/
Right rear stop/turn
lamp/RAP relay/LED
ambient lighting/
Dome-reading lamps
33 Heated seat –
passenger
34 ABS valve
35 Amplifier
37 Right high-beam headlamp

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
318 Index
Child Restraints (cont'd)Lower Anchors and Tethers
for Children . . . . . . . . . . . . . . . . . . . 70
Older Children . . . . . . . . . . . . . . . . . . 64
Securing . . . . . . . . . . . . . . . . . . . . 78, 80
Systems . . . . . . . . . . . . . . . . . . . . . . . . 68
Circuit Breakers . . . . . . . . . . . . . . . . 226
Cleaning Exterior Care . . . . . . . . . . . . . . . . . 264
Interior Care . . . . . . . . . . . . . . . . . . 269
Climate Control Systems Dual Automatic . . . . . . . . . . . . . . . 133
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Cluster, Instrument . . . . . . . . . . . . . . 96
Collision Damage Repair . . . . . . . 297
Compact Spare Tire . . . . . . . . . . . . 258
Compartments Storage . . . . . . . . . . . . . . . . . . . . . . . . . 84
Compass . . . . . . . . . . . . . . . . . . . . . . . . 91
Connected Services Connections . . . . . . . . . . . . . . . . . . 314
Diagnostics . . . . . . . . . . . . . . . . . . . 315
Navigation . . . . . . . . . . . . . . . . . . . . 313
Connections Connected Services . . . . . . . . . . 314
Control Traction and ElectronicStability . . . . . . . . . . . . . . . . . . . . . 163 Control of a Vehicle . . . . . . . . . . . . . 142
Convenience Net . . . . . . . . . . . . . . . . 87
Convex Mirrors . . . . . . . . . . . . . . . . . . 23
Coolant
Engine Temperature Gauge . . 100
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . 133
Cooling System . . . . . . . . . . . . . . . . . 209
Courtesy Lamps . . . . . . . . . . . . . . . . 128
Courtesy Transportation Program . . . . . . . . . . . . . . . . . . . . . . . 296
Cruise Control . . . . . . . . . . . . . . . . . . 165
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Cruise Control, Adaptive . . . . . . . . 167
Cupholders . . . . . . . . . . . . . . . . . . . . . . 85
Customer Assistance . . . . . . . . . . . 293 Offices . . . . . . . . . . . . . . . . . . . . . . . . 292
Text Telephone (TTY)
Users . . . . . . . . . . . . . . . . . . . . . . . 293
Customer Information Publications OrderingInformation . . . . . . . . . . . . . . . . . . 299
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . 290
Cybersecurity . . . . . . . . . . . . . . . . . . . 302
D
Damage Repair, Collision . . . . . . . 297
Danger, Warning, and Caution . . . . 2 Data Collection
Infotainment System . . . . . . . . . . 304
OnStar . . . . . . . . . . . . . . . . . . . . . . . 303
Data Recorders, Event . . . . . . . . . 302
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . 126
Defensive Driving . . . . . . . . . . . . . . . 141
Delayed Locking . . . . . . . . . . . . . . . . . 18
Diagnostics
Connected Services . . . . . . . . . . 315
Distracted Driving . . . . . . . . . . . . . . . 140
Dome Lamps . . . . . . . . . . . . . . . . . . . 129
Door
Ajar Light . . . . . . . . . . . . . . . . . . . . . .110
Delayed Locking . . . . . . . . . . . . . . . . 18
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power Locks . . . . . . . . . . . . . . . . . . . . 18
Drive Belt Routing, Engine . . . . . . 289
Driver Assistance Systems . . . . . 174
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . 110
Driving Assistance Systems . . . . . . . . . . 178
Better Fuel Economy . . . . . . . . . 140
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . 189
Defensive . . . . . . . . . . . . . . . . . . . . . 141
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . 141

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
Index 319
Driving (cont'd)Hill and Mountain Roads . . . . . . 145
If the Vehicle is Stuck . . . . . . . . . 147
Loss of Control . . . . . . . . . . . . . . . 143
Off-Road Recovery . . . . . . . . . . . 143
Vehicle Load Limits . . . . . . . . . . . 147
Wet Roads . . . . . . . . . . . . . . . . . . . 144
Winter . . . . . . . . . . . . . . . . . . . . . . . . 145
Dual Automatic Climate
Control System . . . . . . . . . . . . . . . . 133
E
E85 or FlexFuel . . . . . . . . . . . . . . . . 186
Electric Parking Brake . . . . . . . . . . 161
Electric Parking Brake Light . . . . 105
Electrical Equipment,Add-On . . . . . . . . . . . . . . . . . . . . . . . 197
Electrical System Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 226
Fuses and Circuit Breakers . . . 226
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 229
Overload . . . . . . . . . . . . . . . . . . . . . 225
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . 306
Engine Air Cleaner/Filter . . . . . . . . . . . . . 208 Engine (cont'd)
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 103
Compartment Overview . . . . . . . 203
Coolant Temperature
Gauge . . . . . . . . . . . . . . . . . . . . . . 100
Cooling System . . . . . . . . . . . . . . . 209
Drive Belt Routing . . . . . . . . . . . . 289
Exhaust . . . . . . . . . . . . . . . . . . . . . . 157
Heater . . . . . . . . . . . . . . . . . . . . . . . . 154
Oil Life System . . . . . . . . . . . . . . . 206
Oil Pressure Light . . . . . . . . . . . . 108
Overheated Protection Operating Mode . . . . . . . . . . . . . 213
Overheating . . . . . . . . . . . . . . . . . . 212
Power Messages . . . . . . . . . . . . . .113
Running While Parked . . . . . . . . 157
Starting . . . . . . . . . . . . . . . . . . . . . . . 153
Entry Lighting . . . . . . . . . . . . . . . . . . . 130
Equipment, Towing . . . . . . . . . . . . . 195
Event Data Recorders . . . . . . . . . . 302
Exit Lighting . . . . . . . . . . . . . . . . . . . . 130
Extended Parking . . . . . . . . . . . . . . . 157
Extender, Seat Belt . . . . . . . . . . . . . . 50
Exterior Lamp Controls . . . . . . . . . 125
Exterior Lamps Off Reminder . . . 126
Exterior Lighting Battery Saver . . . . . . . . . . . . . . . . . . . . . . . . . 131
F
Filter,
Engine Air Cleaner . . . . . . . . . . . 208
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 126
Flashers, Hazard Warning . . . . . . 127
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 252 Changing . . . . . . . . . . . . . . . . . . . . . 253
FlexFuel E85 . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Floor Mats . . . . . . . . . . . . . . . . . . . . . . 272
Fluid
Automatic Transmission . . . . . . 207
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 215
Washer . . . . . . . . . . . . . . . . . . . . . . . 214
Folding Mirrors . . . . . . . . . . . . . . . . . . 24
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . 178
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . 300
Front Seats Adjustment . . . . . . . . . . . . . . . . . . . . . 34
Heated and Ventilated . . . . . . . . . . 40
Fuel Additives . . . . . . . . . . . . . . . . . . . . . 186
Economy, Driving for Better . . . 140
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . 189
Filling the Tank . . . . . . . . . . . . . . . 187

Chevrolet Impala Owner Manual (GMNA-Localizing-U.S./Canada-13688912) -
2020 - CRC - 6/5/19
320 Index
Fuel (cont'd)Foreign Countries . . . . . . . . . . . . 186
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Low Fuel Warning Light . . . . . . . 108
Prohibited Fuels . . . . . . . . . . . . . . 186
Recommended . . . . . . . . . . . . . . . 185
Top Tier . . . . . . . . . . . . . . . . . . . . . . 185
Fuses Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 226
Fuses and Circuit Breakers . . . 226
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 229
G
Garage Door Opener . . . . . . . . . . . 121Programming . . . . . . . . . . . . . . . . . 121
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . 219
Gauges Engine CoolantTemperature . . . . . . . . . . . . . . . . 100
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Odometer . . . . . . . . . . . . . . . . . . . . . . . 98
Speedometer . . . . . . . . . . . . . . . . . . . 98
Tachometer . . . . . . . . . . . . . . . . . . . . . 98
Trip Odometer . . . . . . . . . . . . . . . . . . 98
Warning Lights and Indicators . . . . . . . . . . . . . . . . . . . . . 95 General Information
Service and Maintenance . . . . . 274
Towing . . . . . . . . . . . . . . . . . . . . . . . . 189
Vehicle Care . . . . . . . . . . . . . . . . . . 199
Glove Box . . . . . . . . . . . . . . . . . . . . . . . 85
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . . . . 294
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . 221
Hazard Warning Flashers . . . . . . . 127
Head Restraints . . . . . . . . . . . . . . . . . 31
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . 220
Automatic . . . . . . . . . . . . . . . . . . . . . 127
Bulb Replacement . . . . . . . . . . . . 221
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . . 126
Flash-to-Pass . . . . . . . . . . . . . . . . . 126
Headlamps, Front Turn Signal, Sidemarker, and
Parking Lamps . . . . . . . . . . . . . . 221
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . 221
High-Beam On Light . . . . . . . . . . 109
High/Low Beam Changer . . . . . 126
Lamps On Reminder . . . . . . . . . 109 Heated
Steering Wheel . . . . . . . . . . . . . . . . . 89
Heated and Ventilated Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Heated Mirrors . . . . . . . . . . . . . . . . . . . 24
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . 154
Heating . . . . . . . . . . . . . . . . . . . . . . . . . 133
High Voltage Devices and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 225
High-Beam On Light . . . . . . . . . . . . 109
High-Speed Operation . . . . . . . . . . 240
Hill and Mountain Roads . . . . . . . . 145
Hill Start Assist (HSA) . . . . . . . . . . 163
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
How to Wear Seat Belts
Properly . . . . . . . . . . . . . . . . . . . . . . . . 44
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
I
Ignition Positions . . . . . . . . . . . . . . . 151
Immobilizer . . . . . . . . . . . . . . . . . . . . . . 22
Indicator Vehicle Ahead . . . . . . . . . . . . . . . . 106
Infants and Young Children,
Restraints . . . . . . . . . . . . . . . . . . . . . . 65