2019 GMC SIERRA DENALI overheating

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - crc - 5/15/18
328 Vehicle Care
5.3L V8 Engine (L84) Shown, 5.3L
V8 Engine (L82) and 6.2L
V8 Engine (L87) Similar
1. Engine Electric Cooling
Fans (Out of 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. { WarningDo not touch heater, radiator, a/c
pipes or 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 0 331 . What to Use
{ WarningPlain 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. 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.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - crc - 5/15/18
Vehicle Care 331CautionFailure 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.
If no coolant is visible in the surge
tank, add coolant.
1. Remove the coolant surge tank
pressure 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 full
turn. If a hiss is heard, wait for
that to stop. A hiss means
there is still some pressure left.
2. Keep turning the pressure cap
slowly, and remove it.
3. Fill the coolant surge tank with
the proper mixture to the full
cold mark.
4. With the coolant surge tank
pressure cap off, start the
engine and let it run until the
engine coolant temperature
gauge indicates approximately
90 °C (195 °F).
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 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.
CautionIf 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 If the vehicle has the Duramax
diesel engine, see the Duramax
diesel supplement.
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.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - crc - 5/15/18
332 Vehicle Care The vehicle has several indicators
to warn of engine overheating.
There is a coolant temperature
gauge in the vehicle's instrument
cluster. See Engine Coolant
Temperature Gauge 0 145 .
In addition, there are ENGINE
OVERHEATED STOP ENGINE,
ENGINE OVERHEATED IDLE
ENGINE, and ENGINE POWER IS
REDUCED messages in the Driver
Information Center (DIC).
If the decision is made not to lift the
hood when this warning appears,
get service help right away. See
Roadside Assistance Program
0 437 .
If the decision is made to lift the
hood, make sure the vehicle is
parked on a level surface.
2.7L L4, 4.3L V6, 5.3L V8, and 6.2L
V8 Engines
Check to see if the engine cooling
fans are running. If the engine is
overheating, the fans should be running. If they are not, do not
continue to run the engine and have
the vehicle serviced.
If Steam is Coming from the
Engine Compartment
{ WarningSteam 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 Compartment
The ENGINE OVERHEATED STOP
ENGINE or the ENGINE
OVERHEATED IDLE ENGINE
message, along with a low coolant
condition, can indicate a serious
problem. The 2.7L engine will shut down
automatically if the ENGINE
OVERHEATED STOP ENGINE
message displays.
If there is an engine overheat
warning, but no steam is 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.
.
Tows a trailer; see Trailer Towing
0 281 .
If the ENGINE OVERHEATED
STOP ENGINE or the ENGINE
OVERHEATED IDLE ENGINE
message appears with no sign of
steam, try this for a minute or so:
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.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - crc - 5/15/18
358 Vehicle Care Fuses Usage
F17 MFEG
F18 –
F20 Endgate
F22 Rear sliding window
F23 –
F24 –
F25 –
F26 –
F27 –
Circuit
Breakers Usage
CB1 –
Relays Usage
K1 Rear sliding
window open
K2 Rear sliding window
close
K3 MFEG major 1
K4 MFEG minor 1 Relays Usage
K5 MFEG minor 2
K6 MFEG major 2
K7 Anti-theft
K8 –
Wheels and Tires Tires Every new GM vehicle has
high-quality tires made by a
leading tire manufacturer. See
the warranty manual for
information regarding the tire
warranty and where to get
service. For additional
information refer to the tire
manufacturer.
{ Warning.
Poorly maintained and
improperly used tires are
dangerous. .
Overloading the tires can
cause overheating as a
result of too much
flexing. There could be a
blowout and a serious
crash. See Vehicle Load
Limits 0 209 .
(Continued)

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - crc - 5/15/18
Vehicle Care 367government testing procedures.
The ratings are molded into the
sidewall of the tire. See Uniform
Tire Quality Grading 0 380 .
Vehicle Capacity Weight :
The
number of designated seating
positions multiplied by
68 kg (150 lb) plus the rated
cargo load. See Vehicle Load
Limits 0 209 .
Vehicle Maximum Load on the
Tire :
Load on an individual tire
due to curb weight, accessory
weight, occupant weight, and
cargo weight.
Vehicle Placard :
A label
permanently attached to a
vehicle showing the vehicle
capacity weight and the original
equipment tire size and
recommended inflation pressure.
See “ Tire and Loading
Information Label ” under Vehicle
Load Limits 0 209 . Tire Pressure Tires need the correct amount of
air pressure to operate
effectively.
{ Warning
Neither tire underinflation nor
overinflation is good.
Underinflated tires, or tires
that do not have enough air,
can result in: .
Tire overloading and
overheating which could
lead to a blowout. .
Premature or
irregular wear. .
Poor handling. .
Reduced fuel economy.
Overinflated tires, or tires that
have too much air, can
result in:
.
Unusual wear.
(Continued) Warning (Continued) .
Poor handling. .
Rough ride. .
Needless damage from
road hazards.
The Tire and Loading
Information label on the vehicle
indicates the original equipment
tires and the correct cold tire
inflation pressures. The
recommended pressure is the
minimum air pressure needed to
support the vehicle's maximum
load carrying capacity.
For additional information
regarding how much weight the
vehicle can carry, and an
example of the Tire and Loading
Information label, see Vehicle
Load Limits 0 209 . How the
vehicle is loaded affects vehicle
handling and ride comfort. Never

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-1500-11698638) - 2019 - crc - 5/16/18
462 Index Door (cont'd)
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Power Locks . . . . . . . . . . . . . . . . . . . . 45
Drive Belt Routing, Engine . . . . . . 432
Driver Assistance Systems . . . . . 253
Driver Information
Center (DIC) . . . . . . . . . . . . . 159, 160
Driver Mode Control . . . . . . . . . . . . 246
Driver Mode Control Light . . . . . . 156
Driving
Assistance Systems . . . . . . . . . . 260
Characteristics and
Towing Tips . . . . . . . . . . . . . . . . . 276
Defensive . . . . . . . . . . . . . . . . . . . . . 198
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . 198
For Better Fuel Economy . . . . . . . 29
Hill and Mountain Roads . . . . . . 206
If the Vehicle is Stuck . . . . . . . . . 208
Loss of Control . . . . . . . . . . . . . . . 200
Off-Road . . . . . . . . . . . . . . . . . . . . . 200
Off-Road Recovery . . . . . . . . . . . 199
Vehicle Load Limits . . . . . . . . . . . 209
Wet Roads . . . . . . . . . . . . . . . . . . . 205
Winter . . . . . . . . . . . . . . . . . . . . . . . . 206
Dual Automatic Climate
Control System . . . . . . . . . . . . . . . . 190 E E85 or FlexFuel . . . . . . . . . . . . . . . . 272
Electric Parking Brake . . . . . . . . . . 241
Electric Parking Brake Light . . . . 152
Electrical Equipment,
Add-On . . . . . . . . . . . . . . . . . . . . . . . 306
Electrical System
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 350
Fuses and Circuit Breakers . . . 350
Instrument Panel Fuse
Block . . . . . . . . . . . . . . . . . . . 354, 356
Overload . . . . . . . . . . . . . . . . . . . . . 349
Electronic Stability Control
(ESC) Off Light . . . . . . . . . . . . . . . . 155
Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . 448
Engine
Air Cleaner/Filter . . . . . . . . . . . . . 326
Check Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 149
Compartment Overview . . . . . . . 316
Coolant Temperature
Gauge . . . . . . . . . . . . . . . . . . . . . . 145
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . 155
Cooling System . . . . . . . . . . . . . . . 327
Drive Belt Routing . . . . . . . . . . . . 432 Engine (cont'd)
Exhaust . . . . . . . . . . . . . . . . . . . . . . 228
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Heater . . . . . . . . . . . . . . . . . . . . . . . . 223
Oil Life System . . . . . . . . . . . . . . . 323
Oil Pressure Gauge . . . . . . . . . . 144
Oil Pressure Light . . . . . . . . . . . . 157
Overheated Protection
Operating Mode . . . . . . . . . . . . . 333
Overheating . . . . . . . . . . . . . . . . . . 331
Power Messages . . . . . . . . . . . . . 167
Running While Parked . . . . . . . . 229
Starting . . . . . . . . . . . . . . . . . . . . . . . 221
Engine Air Filter Life System . . . . 325
Entry Lighting . . . . . . . . . . . . . . . . . . . 184
Equipment, Towing . . . . . . . . . . . . . 285
Event Data Recorders . . . . . . . . . . 445
Exit Lighting . . . . . . . . . . . . . . . . . . . . 184
Extended Parking . . . . . . . . . . . . . . . 228
Extender, Seat Belt . . . . . . . . . . . . . . 84
Exterior Cargo Lamps . . . . . . . . . . 182
Exterior Lamp Controls . . . . . . . . . 176
Exterior Lamps Off Reminder . . . 178
Exterior Lighting Battery
Saver . . . . . . . . . . . . . . . . . . . . . . . . . 185

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-1500-11698638) - 2019 - crc - 5/16/18
466 Index Mirror
Rear Camera . . . . . . . . . . . . . . . . . . . 60
Mirrors
Automatic Dimming . . . . . . . . . . . . . 58
Automatic Dimming
Rearview . . . . . . . . . . . . . . . . . . . . . . 60
Blind Spot . . . . . . . . . . . . . . . . . . . . . . 58
Convex . . . . . . . . . . . . . . . . . . . . . . . . . 56
Folding . . . . . . . . . . . . . . . . . . . . . . . . . 57
Heated . . . . . . . . . . . . . . . . . . . . . . . . . 58
Manual . . . . . . . . . . . . . . . . . . . . . . . . . 56
Manual Rearview . . . . . . . . . . . . . . . 60
Power . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Tilt in Reverse . . . . . . . . . . . . . . . . . . 59
Mirrors, Interior Rearview . . . . . . . . 60
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Driver Control . . . . . . . . . . . . . . . . . 246
Monitor System, Tire
Pressure . . . . . . . . . . . . . . . . . . . . . . 369
N Navigation
Connected Services . . . . . . . . . . 455
New Vehicle Break-In . . . . . . . . . . . 216
Noise Control System . . . . . . . . . . 342 O Odometer . . . . . . . . . . . . . . . . . . . . . . . 142
Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Off-Road . . . . . . . . . . . . . . . . . . . . . . . 200
Driving . . . . . . . . . . . . . . . . . . . . . . . . 200
Recovery . . . . . . . . . . . . . . . . . . . . . 199
Oil
Engine . . . . . . . . . . . . . . . . . . . . . . . . 321
Engine Oil Life System . . . . . . . 323
Engine Oil Pressure Gauge . . . 144
Pressure Light . . . . . . . . . . . . . . . . 157
Older Children, Restraints . . . . . . . 99
Online Owner Center . . . . . . . . . . . 436
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . 446
OnStar Additional
Information . . . . . . . . . . . . . . . . . . . . 449
OnStar Emergency . . . . . . . . . . . . . 448
OnStar Overview . . . . . . . . . . . . . . . 447
OnStar Security . . . . . . . . . . . . . . . . 449
Operating Mode
Overheated Engine
Protection . . . . . . . . . . . . . . . . . . . 333
Operation
Fog Lamps . . . . . . . . . . . . . . . . . . . 181
Outlets
Power . . . . . . . . . . . . . . . . . . . . . . . . 132
Overheated Engine
Protection Operating Mode . . . . 333 Overheating, Engine . . . . . . . . . . . . 331
P Park
Shifting Into . . . . . . . . . . . . . . . . . . . 225
Shifting Out of . . . . . . . . . . . . . . . . 227
Park Assist . . . . . . . . . . . . . . . . . . . . . 254
Parking
Brake and P (Park)
Mechanism Check . . . . . . . . . . 343
Extended . . . . . . . . . . . . . . . . . . . . . 228
Over Things That Burn . . . . . . . 227
Parking or Backing
Assistance Systems . . . . . . . . . . 254
Passenger Airbag Status
Indicator . . . . . . . . . . . . . . . . . . . . . . 148
Passenger Compartment Air
Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Passenger Sensing System . . . . . 92
Pedestrian Ahead Indicator . . . . . 154
Perchlorate Materials
Requirements, California . . . . . . 313
Personalization
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 167
Pickup Conversion to
Chassis Cab . . . . . . . . . . . . . . . . . . 310
Power
Door Locks . . . . . . . . . . . . . . . . . . . . . 45