2018 GMC YUKON overheating

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
298 Vehicle Care
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
full cold 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.
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
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.
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 0141.
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
0 396.
If the decision is made to lift the
hood, make sure the vehicle is
parked on a level surface.
Check to see if the engine cooling
fan(s) are running. If the engine is
overheating, the fans should be
running. If they are not, do not
continue to run the engine. Have the
vehicle serviced.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
324 Vehicle Care
RelaysUsage
1 Rear window defogger
16 Liftgate
17 Liftglass
18 Rear fog lamp
20 Heated mirrorWheels 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 0204.
(Continued)
Warning (Continued)
.Underinflated tires pose
the same danger as
overloaded tires. The
resulting crash could
cause serious injury.
Check all tires frequently
to maintain the
recommended pressure.
Tire pressure should be
checked when the tires
are cold.
.Overinflated tires are
more likely to be cut,
punctured, or broken by
a sudden impact —such
as when hitting a pothole.
Keep tires at the
recommended pressure.
.Worn or old tires can
cause a crash. If the
tread is badly worn,
replace them.
(Continued)

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
Vehicle Care 331
Vehicle Capacity Weight:The
number of designated seating
positions multiplied by
68 kg (150 lb) plus the rated
cargo load. See Vehicle Load
Limits 0204.
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” underVehicle
Load Limits 0204.
Tire Pressure
Tires need the correct amount of
air pressure to operate
effectively. Caution
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.
.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 0204. How the
vehicle is loaded affects vehicle
handling and ride comfort. Never
load the vehicle with more
weight than it was designed to
carry.
When to Check
Check the tires once a month
or more.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
Index 421
Driving (cont'd)Defensive . . . . . . . . . . . . . . . . . . . . . 194
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . 194
For Better Fuel Economy . . . . . . . 27
Hill and Mountain Roads . . . . . . 202
If the Vehicle is Stuck . . . . . . . . . 203
Loss of Control . . . . . . . . . . . . . . . 196
Off-Road . . . . . . . . . . . . . . . . . . . . . 196
Off-Road Recovery . . . . . . . . . . . 195
Vehicle Load Limits . . . . . . . . . . . 204
Wet Roads . . . . . . . . . . . . . . . . . . . 201
Winter . . . . . . . . . . . . . . . . . . . . . . . . 202
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . 184
E
E85 or FlexFuel . . . . . . . . . . . . . . . . 260
Electrical Equipment,Add-On . . . . . . . . . . . . . . . . . . . . . . . 279
Electrical System Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 314
Fuses and Circuit Breakers . . . 313
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . 318, 321
Overload . . . . . . . . . . . . . . . . . . . . . 313
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 323 Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . 407
Engine Air Cleaner/Filter . . . . . . . . . . . . . 294
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . 146
Compartment Overview . . . . . . . 284
Coolant Temperature
Gauge . . . . . . . . . . . . . . . . . . . . . . 141
Coolant Temperature Warning Light . . . . . . . . . . . . . . . 151
Cooling System . . . . . . . . . . . . . . . 295
Drive Belt Routing . . . . . . . . . . . . 391
Exhaust . . . . . . . . . . . . . . . . . . . . . . 219
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Heater . . . . . . . . . . . . . . . . . . . . . . . . 215
Oil Life System . . . . . . . . . . . . . . . 289
Oil Pressure Gauge . . . . . . . . . . 140
Oil Pressure Light . . . . . . . . . . . . 152
Overheating . . . . . . . . . . . . . . . . . . 298
Power Messages . . . . . . . . . . . . . 161
Running While Parked . . . . . . . . 220
Starting . . . . . . . . . . . . . . . . . . . . . . . 213
Entry Lighting . . . . . . . . . . . . . . . . . . . 181
Equipment, Towing . . . . . . . . . . . . . 271
Event Data Recorders . . . . . . . . . . 404
Exit Lighting . . . . . . . . . . . . . . . . . . . . 181
Extended Parking . . . . . . . . . . . . . . . 219 Extender, Seat Belt . . . . . . . . . . . . . . 85
Exterior Lamp Controls . . . . . . . . . 174
Exterior Lamps Off Reminder . . . 176
Exterior Lighting Battery
Saver . . . . . . . . . . . . . . . . . . . . . . . . . 182
F
FanEngine . . . . . . . . . . . . . . . . . . . . . . . . 300
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . 12
Filter,
Engine Air Cleaner . . . . . . . . . . . 294
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 176
Flashers, Hazard Warning . . . . . . 178
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . 345 Changing . . . . . . . . . . . . . . . . . . . . . 346
FlexFuel E85 . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Floor Mats . . . . . . . . . . . . . . . . . . . . . . 373
Fluid AutomaticTransmission . . . . . . . . . . . 290, 293
Brakes . . . . . . . . . . . . . . . . . . . . . . . . 302
Four-Wheel Drive Transfer Case . . . . . . . . . . . . . . . 226
Washer . . . . . . . . . . . . . . . . . . . . . . . 300
Fog Lamps . . . . . . . . . . . . . . . . . . . . . 179

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
Index 425
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . 139Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Off-Road . . . . . . . . . . . . . . . . . . . . . . . 196 Driving . . . . . . . . . . . . . . . . . . . . . . . . 196
Recovery . . . . . . . . . . . . . . . . . . . . . 195
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . 287
Engine Oil Life System . . . . . . . 289
Engine Oil Pressure Gauge . . . 140
Pressure Light . . . . . . . . . . . . . . . . 152
Older Children, Restraints . . . . . . 100
Online Owner Center . . . . . . . . . . . 395
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . 405
OnStar Additional Information . . . . . . . . . . . . . . . . . . . . 412
OnStar Connections . . . . . . . . . . . . 409
OnStar Diagnostics . . . . . . . . . . . . . 411
OnStar Emergency . . . . . . . . . . . . . 407
OnStar Navigation . . . . . . . . . . . . . . 408
OnStar Overview . . . . . . . . . . . . . . . 406
OnStar Security . . . . . . . . . . . . . . . . 408
Operation Fog Lamps . . . . . . . . . . . . . . . . . . . 179
Ordering Service Publications . . . . . . . . . . 401
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . 130 Overheating, Engine . . . . . . . . . . . . 298P
Park
Shifting Into . . . . . . . . . . . . . . . . . . . 217
Shifting Out of . . . . . . . . . . . . . . . . 218
Parking
Brake . . . . . . . . . . . . . . . . . . . . . . . . . 232
Brake and P (Park)Mechanism Check . . . . . . . . . . 307
Extended . . . . . . . . . . . . . . . . . . . . . 219
Over Things That Burn . . . . . . . 218
Parking Assist . . . . . . . . . . . . . . . . . . 248
Parking or Backing Assistance Systems . . . . . . . . . . 248
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . 145
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Passenger Sensing System . . . . . 93
Perchlorate Materials Requirements, California . . . . . . 282
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . 162
Power Door Locks . . . . . . . . . . . . . . . . . . . . . 43
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Outlets . . . . . . . . . . . . . . . . . . . . . . . 130 Power (cont'd)
Protection, Battery . . . . . . . . . . . . 182
Retained Accessory (RAP) . . . 216
Seat Adjustment . . . . . . . . . . . . . . . . 64
Windows . . . . . . . . . . . . . . . . . . . . . . . 58
Power Assist Steps . . . . . . . . . . . . . . 50
Pregnancy, Using Seat Belts . . . . 84
Privacy Vehicle Data Recording . . . . . . . 404
Program Courtesy Transportation . . . . . . 398
Proposition 65 Warning,
California . . . . . . . . . . . .281, 303, 356, Back Cover
R
Radio Frequency Statement . . . . 402
Reading Lamps . . . . . . . . . . . . . . . . . 180
Rear Axle . . . . . . . . . . . . . . . . . . . . . . . 305Locking . . . . . . . . . . . . . . . . . . . . . . . 237
Rear Climate Control System . . . 188
Rear Seats . . . . . . . . . . . . . . . . . . . . . . 70 Heated . . . . . . . . . . . . . . . . . . . . . . . . . 71
Rear Storage . . . . . . . . . . . . . . . . . . . 122
Rear Vision Camera (RVC) . . . . . 248
Rear Window Washer/Wiper . . . . 128
Rearview Mirrors . . . . . . . . . . . . . . . . 57