engine overheat GMC SIERRA DENALI 2019 Owner's Manual

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
Vehicle Care 3333. 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 overheat zone 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 still no sign of steam and
the vehicle is equipped with an
engine driven cooling fan, push
down the accelerator until the
engine speed is about twice as fast
as normal idle speed for at least
five minutes while the vehicle is
parked. If the warning is still there,
turn off the engine and get everyone
out of the vehicle until it cools down. If there is no sign of steam, idle the
engine for five minutes while
parked. If the warning is still
displayed, turn off the engine until it
cools down.
Overheated Engine
Protection
Operating Mode If an overheated engine condition
exists and the ENGINE POWER IS
REDUCED message displays, an
overheat protection mode which
alternates firing groups of cylinders
helps to prevent engine damage. In
this mode, a loss in power and
engine performance will be noticed.
This operating mode allows the
vehicle to be driven to a safe place
in an emergency. Driving extended
distances and/or towing a trailer in
the overheat protection mode
should be avoided. CautionAfter driving in the overheated
engine protection operating
mode, the engine oil will be
severely degraded. Any repairs
performed before the engine is
cool may cause engine damage.
Allow the engine to cool before
attempting any repair. Repair the
cause of coolant loss, change the
oil, and reset the oil life system.
See Engine Oil 0 321 .
Engine Fan The vehicle has electric cooling
fan(s). The fans may be heard
spinning at low speed during most
everyday driving. The fans may turn
off if no cooling is required. Under
heavy vehicle loading, trailer towing,
high outside temperatures,
or operation of the air conditioning
system, the fans may change to
high speed and an increase in fan
noise may be heard. This is normal
and indicates that the cooling
system is functioning properly. The

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - crc - 5/15/18
350 Vehicle Care Windshield Wipers If the wiper motor overheats due to
heavy snow or ice, the windshield
wipers will stop until the motor cools
and will then restart.
Although the circuit is protected
from electrical overload, overload
due to heavy snow or ice may
cause wiper linkage damage.
Always clear ice and heavy snow
from the windshield before using the
windshield wipers.
If the overload is caused by an
electrical problem and not snow or
ice, be sure to get it fixed.
Fuses and Circuit
Breakers The wiring circuits in the vehicle are
protected from short circuits by a
combination of fuses and circuit
breakers. This greatly reduces the
chance of damage caused by
electrical problems. { DangerFuses and circuit breakers are
marked with their ampere rating.
Do not exceed the
specified amperage rating when
replacing fuses and circuit
breakers. Use of an oversized
fuse or circuit breaker can result
in a vehicle fire. You and others
could be seriously injured or
killed.
To check a fuse, look at the
silver-colored band inside the fuse.
If the band is broken or melted,
replace the fuse. Be sure to replace
a bad fuse with a new one of the
identical size and rating.
Fuses of the same amperage can
be temporarily borrowed from
another fuse location, if a fuse goes
out. Replace the fuse as soon as
possible. Engine Compartment
Fuse Block If the vehicle has a diesel engine,
see the Duramax diesel
supplement.
The engine compartment fuse block
is in the engine compartment, on
the passenger side of the vehicle.
Lift the cover to access the fuse
block.

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