2018 GMC YUKON XL Owners Manual

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
184 Climate Controls The climate control system uses the
information from these sensors to
maintain comfort settings by
adjusting the outlet temperature, fan
speed, and air delivery mode. The
system may also supply cooler air to
the side of the vehicle facing the
sun. The recirculation mode will also
be used as needed to maintain cool
outlet temperatures.
Rear Climate Control
System The rear climate control system is
located on the rear of the center
console storage. The rear climate
settings can be adjusted with this
system. 1. Fan Control
2. AUTO (Automatic Operation)
3. MODE (Air Delivery Mode
Control)
4. TEMP (Temperature Control)
5. Heated Rear Seats (If
Equipped)
If the dual automatic climate control
system rear climate control lockout
feature is locked, the rear climate
control settings can only be
adjusted from the front seat. Automatic Operation AUTO : Press AUTO to
automatically control the
temperature, air delivery, and fan
speed for rear seat passengers. A is
indicated in the display when
automatic operation is active.
If any of the rear climate control
settings are manually adjusted, full
automatic operation is cancelled.
Press AUTO to return to full
automatic operation.
The display only indicates climate
control functions when the system is
in rear independent mode.
Manual Operation
9 : Turn clockwise or
counterclockwise to increase or
decrease the fan speed. Turn
completely counterclockwise to turn
the fan/power off.
TEMP : Turn clockwise or
counterclockwise to increase or
decrease the airflow temperature
into the passenger area. If the
SYNC button is pressed on the front

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Climate Controls 185climate controls, the rear climate
temperature is linked to the driver
temperature setting.
MODE : Press to change the
direction of the airflow in the vehicle.
Repeatedly press the button until
the desired mode appears on the
display. Multiple presses will cycle
through the delivery selections.
M or
L : If equipped, press
M or
Lto heat the left or right outboard seat
cushion. See Heated Rear Seats
0 69 . Air Vents Adjustable air vents are in the
center and on the side of the
instrument panel.
1. Slider Knob
2. Thumbwheel
Move the slider knobs (1) to change
the direction of the airflow.
Use the thumbwheels (2) near the
air vents to open or close off the
airflow. Operation Tips
.
Clear away any ice, snow,
or leaves from the air inlets at
the base of the windshield that
could block the flow of air into
the vehicle.
.
Clear snow off the hood to
improve visibility and help
decrease moisture drawn into
the vehicle.
.
When you enter a vehicle in cold
weather, press the fan up button
to the maximum fan level before
driving. This helps clear the
intake ducts of snow and
moisture, and reduces the
chance of fogging the inside of
the window.
.
Keep the air path under the front
seats clear of objects to help
circulate the air inside of the
vehicle more effectively.
.
Use of non-GM approved hood
deflectors can adversely affect
the performance of the system.
Check with your dealer before
adding equipment to the outside
of the vehicle.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
186 Climate Controls
Maintenance Passenger Compartment
Air Filter The filter reduces the dust, pollen,
and other airborne irritants from
outside air that is pulled into the
vehicle.
The filter should be replaced as part
of routine scheduled maintenance.
See Maintenance Schedule 0 370 .
To find out what type of filter to use,
see Maintenance Replacement
Parts 0 380 .
1. Open the glove box completely. 2. Disconnect the glove box door
damper string from the glove
box door assembly. A pen or
pencil may be inserted through
the end of the damper string to
prevent the string from slipping
inside the door assembly.
3. Remove the six screws and
remove the access plate. 4. Release the two tabs holding
the service door. Open the
service door and remove the
old filter.
5. Install the new air filter.
6. Close the service door and
secure the tabs.
7. Reverse the steps to reinstall
the glove box.
See your dealer if additional
assistance is needed.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/20/17
Climate Controls 187
Service All vehicles have a label underhood
that identifies the refrigerant used in
the vehicle. The refrigerant system
should only be serviced by trained
and certified technicians. The air
conditioning evaporator should
never be repaired or replaced by
one from a salvage vehicle.
It should only be replaced by a new
evaporator to ensure proper and
safe operation.
During service, all refrigerants
should be reclaimed with proper
equipment. Venting refrigerants
directly to the atmosphere is harmful
to the environment and may also
create unsafe conditions based on
inhalation, combustion, frostbite,
or other health-based concerns.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
188 Driving and Operating
Driving and
Operating Driving Information Distracted Driving . . . . . . . . . . . . 189
Defensive Driving . . . . . . . . . . . . . 190
Drunk Driving . . . . . . . . . . . . . . . . . 190
Control of a Vehicle . . . . . . . . . . . 190
Braking . . . . . . . . . . . . . . . . . . . . . . . 190
Steering . . . . . . . . . . . . . . . . . . . . . . 191
Off-Road Recovery . . . . . . . . . . . 191
Loss of Control . . . . . . . . . . . . . . . 192
Off-Road Driving . . . . . . . . . . . . . 192
Driving on Wet Roads . . . . . . . . 197
Hill and Mountain Roads . . . . . 198
Winter Driving . . . . . . . . . . . . . . . . 198
If the Vehicle Is Stuck . . . . . . . . 200
Vehicle Load Limits . . . . . . . . . . . 200
Starting and Operating New Vehicle Break-In . . . . . . . . . 204
Adjustable Throttle and Brake
Pedal . . . . . . . . . . . . . . . . . . . . . . . 205
Ignition Positions (Keyless
Access) . . . . . . . . . . . . . . . . . . . . . 205
Ignition Positions (Key
Access) . . . . . . . . . . . . . . . . . . . . . 207
Starting the Engine . . . . . . . . . . . 209
Engine Heater . . . . . . . . . . . . . . . . 210 Retained Accessory
Power (RAP) . . . . . . . . . . . . . . . . 212
Shifting Into Park . . . . . . . . . . . . . 212
Shifting out of Park . . . . . . . . . . . 213
Parking over Things
That Burn . . . . . . . . . . . . . . . . . . . 214
Active Fuel Management . . . . . 214
Extended Parking . . . . . . . . . . . . 214
Engine Exhaust Engine Exhaust . . . . . . . . . . . . . . 215
Running the Vehicle While
Parked . . . . . . . . . . . . . . . . . . . . . . 215
Automatic Transmission Automatic Transmission . . . . . . 216
Manual Mode . . . . . . . . . . . . . . . . . 218
Tow/Haul Mode . . . . . . . . . . . . . . . 222
Drive Systems Four-Wheel Drive . . . . . . . . . . . . . 222
Brakes Antilock Brake
System (ABS) . . . . . . . . . . . . . . . 227
Parking Brake . . . . . . . . . . . . . . . . 228
Brake Assist . . . . . . . . . . . . . . . . . . 228
Hill Start Assist (HSA) . . . . . . . . 229
Ride Control Systems
Traction Control/Electronic
Stability Control . . . . . . . . . . . . . 229 Hill Descent Control (HDC) . . . 231
Magnetic Ride Control . . . . . . . . 232
Locking Rear Axle . . . . . . . . . . . . 232
Automatic Level Control . . . . . . 232
Cruise Control Cruise Control . . . . . . . . . . . . . . . . 233
Adaptive Cruise Control . . . . . . 235
Driver Assistance Systems Driver Assistance Systems . . . 242
Assistance Systems for
Parking or Backing . . . . . . . . . . 243
Assistance Systems for
Driving . . . . . . . . . . . . . . . . . . . . . . 246
Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . . 246
Forward Automatic
Braking (FAB) . . . . . . . . . . . . . . . 248
Side Blind Zone
Alert (SBZA) . . . . . . . . . . . . . . . . 250
Lane Change Alert (LCA) . . . . . 250
Lane Departure
Warning (LDW) . . . . . . . . . . . . . 252
Lane Keep Assist (LKA) . . . . . . 252
Fuel Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 254
California Fuel
Requirements . . . . . . . . . . . . . . . 255
Fuels in Foreign Countries . . . 255
Fuel Additives . . . . . . . . . . . . . . . . 255

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
Driving and Operating 189E85 or FlexFuel . . . . . . . . . . . . . . 256
Filling the Tank . . . . . . . . . . . . . . . 256
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . 258
Trailer Towing General Towing
Information . . . . . . . . . . . . . . . . . . 259
Driving Characteristics and
Towing Tips . . . . . . . . . . . . . . . . . 259
Trailer Towing . . . . . . . . . . . . . . . . 262
Towing Equipment . . . . . . . . . . . . 267
Trailer Sway Control (TSC) . . . 273
Conversions and Add-Ons Add-On Electrical
Equipment . . . . . . . . . . . . . . . . . . 274 Driving Information Distracted Driving Distraction comes in many forms
and can take your focus from the
task of driving. Exercise good
judgment and do not let other
activities divert your attention away
from the road. Many local
governments have enacted laws
regarding driver distraction. Become
familiar with the local laws in
your area.
To avoid distracted driving, keep
your eyes on the road, keep your
hands on the steering wheel, and
focus your attention on driving.
.
Do not use a phone in
demanding driving situations.
Use a hands-free method to
place or receive necessary
phone calls.
.
Watch the road. Do not read,
take notes, or look up
information on phones or other
electronic devices. .
Designate a front seat
passenger to handle potential
distractions.
.
Become familiar with vehicle
features before driving, such as
programming favorite radio
stations and adjusting climate
control and seat settings.
Program all trip information into
any navigation device prior to
driving.
.
Wait until the vehicle is parked
to retrieve items that have fallen
to the floor.
.
Stop or park the vehicle to tend
to children.
.
Keep pets in an appropriate
carrier or restraint.
.
Avoid stressful conversations
while driving, whether with a
passenger or on a cell phone.
{ Warning
Taking your eyes off the road too
long or too often could cause a
crash resulting in injury or death.
Focus your attention on driving.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
190 Driving and Operating Refer to the infotainment section for
more information on using that
system and the navigation system,
if equipped, including pairing and
using a cell phone.
Defensive Driving Defensive driving means “ always
expect the unexpected. ” The first
step in driving defensively is to wear
the seat belt. See Seat Belts 0 76 .
.
Assume that other road users
(pedestrians, bicyclists, and
other drivers) are going to be
careless and make mistakes.
Anticipate what they might do
and be ready.
.
Allow enough following distance
between you and the driver in
front of you.
.
Focus on the task of driving.
Drunk Driving Death and injury associated with
drinking and driving is a global
tragedy. { WarningDrinking and then driving is very
dangerous. Your reflexes,
perceptions, attentiveness, and
judgment can be affected by even
a small amount of alcohol. You
can have a serious — or even
fatal — collision if you drive after
drinking.
Do not drink and drive or ride with
a driver who has been drinking.
Ride home in a cab; or if you are
with a group, designate a driver
who will not drink.
Control of a Vehicle Braking, steering, and accelerating
are important factors in helping to
control a vehicle while driving.
Braking Braking action involves perception
time and reaction time. Deciding to
push the brake pedal is perception
time. Actually doing it is
reaction time. Average driver reaction time is
about three-quarters of a second. In
that time, a vehicle moving at
100 km/h (60 mph) travels 20 m
(66 ft), which could be a lot of
distance in an emergency.
Helpful braking tips to keep in mind
include:
.
Keep enough distance between
you and the vehicle in front
of you.
.
Avoid needless heavy braking.
.
Keep pace with traffic.
If the engine ever stops while the
vehicle is being driven, brake
normally but do not pump the
brakes. Doing so could make the
pedal harder to push down. If the
engine stops, there will be some
power brake assist but it will be
used when the brake is applied.
Once the power assist is used up, it
can take longer to stop and the
brake pedal will be harder to push.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - crc - 6/21/17
Driving and Operating 191
Steering Electric Power Steering This vehicle has electric power
steering. It does not have power
steering fluid. Regular maintenance
is not required.
If power steering assist is lost due
to a system malfunction, the vehicle
can be steered, but may require
increased effort.
See your dealer if there is a
problem.
If the steering assist is used for an
extended period of time while the
vehicle is not moving, power assist
may be reduced.
If the steering wheel is turned until it
reaches the end of its travel, and is
held in that position for an extended
period of time, power steering assist
may be reduced.
Normal use of the power steering
assist should return when the
system cools down.
See your dealer if there is a
problem. Curve Tips .
Take curves at a reasonable
speed.
.
Reduce speed before entering a
curve.
.
Maintain a reasonable steady
speed through the curve.
.
Wait until the vehicle is out of
the curve before accelerating
gently into the straightaway.
Steering in Emergencies .
There are some situations when
steering around a problem may
be more effective than braking.
.
Holding both sides of the
steering wheel allows you to turn
180 degrees without removing
a hand.
.
Antilock Brake System (ABS)
allows steering while braking. Off-Road Recovery
The vehicle's right wheels can drop
off the edge of a road onto the
shoulder while driving. Follow
these tips:
1. Ease off the accelerator and
then, if there is nothing in the
way, steer the vehicle so that it
straddles the edge of the
pavement.
2. Turn the steering wheel about
one-eighth of a turn, until the
right front tire contacts the
pavement edge.