climate control GMC YUKON 2018 Owner's Guide

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
188 Climate Controls
There is also an exterior
temperature sensor behind the front
grille. This sensor reads the outside
air temperature and helps maintain
the temperature inside the vehicle.
Any cover on the front of the
vehicle, including a snowplow, could
cause a false reading in the
displayed temperature.
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 ModeControl)
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.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
Climate Controls 189
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
climate 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.
MorL: If equipped, pressMorLto heat the left or right outboard seat
cushion. See Heated Rear Seats (If
Equipped) 071.
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 - 11/3/17
190 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.
SeeMaintenance Schedule 0376.
To find out what type of filter to use,
see Maintenance Replacement
Parts 0386.
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 holdingthe 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 - 11/3/17
Climate Controls 191
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 - 11/3/17
Driving and Operating 193
Fuel
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 259
California FuelRequirements . . . . . . . . . . . . . . . 260
Fuels in Foreign Countries . . . 260
Fuel Additives . . . . . . . . . . . . . . . . 260
E85 or FlexFuel . . . . . . . . . . . . . . 260
Filling the Tank . . . . . . . . . . . . . . . 261
Filling a Portable Fuel Container . . . . . . . . . . . . . . . . . . . 263
Trailer Towing
General TowingInformation . . . . . . . . . . . . . . . . . . 263
Driving Characteristics and Towing Tips . . . . . . . . . . . . . . . . . 263
Trailer Towing . . . . . . . . . . . . . . . . 266
Towing Equipment . . . . . . . . . . . . 271
Trailer Sway Control (TSC) . . . 277
Conversions and Add-Ons
Add-On Electrical Equipment . . . . . . . . . . . . . . . . . . 279
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.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
Driving and Operating 203
.Allow greater following distance
and watch for slippery spots. Icy
patches can occur on otherwise
clear roads in shaded areas.
The surface of a curve or an
overpass can remain icy when
the surrounding roads are clear.
Avoid sudden steering
maneuvers and braking while
on ice.
. Turn off cruise control.
Blizzard Conditions
Stop the vehicle in a safe place and
signal for help. Stay with the vehicle
unless there is help nearby.
If possible, use Roadside
Assistance. See Roadside
Assistance Program 0396. To get
help and keep everyone in the
vehicle safe:
. Turn on the hazard warning
flashers.
. Tie a red cloth to an outside
mirror.
{Warning
Snow can trap engine exhaust
under the vehicle. This may
cause exhaust gases to get
inside. Engine exhaust contains
carbon monoxide (CO), which
cannot be seen or smelled. It can
cause unconsciousness and even
death.
If the vehicle is stuck in snow:
. Clear snow from the base of
the vehicle, especially any
blocking the exhaust pipe.
. Open a window about 5 cm
(2 in) on the vehicle side
that is away from the wind,
to bring in fresh air.
. Fully open the air outlets on
or under the instrument
panel.
. Adjust the climate control
system to circulate the air
inside the vehicle and set
(Continued)
Warning (Continued)
the fan speed to the highest
setting. See“Climate
Control Systems.”
For more information about CO,
see Engine Exhaust 0219.
To save fuel, run the engine for
short periods to warm the vehicle
and then shut the engine off and
partially close the window. Moving
about to keep warm also helps.
If it takes time for help to arrive,
when running the engine, push the
accelerator pedal slightly so the
engine runs faster than the idle
speed. This keeps the battery
charged to restart the vehicle and to
signal for help with the headlamps.
Do this as little as possible, to
save fuel.
If the Vehicle Is Stuck
Slowly and cautiously spin the
wheels to free the vehicle when
stuck in sand, mud, ice, or snow.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
236 Driving and Operating
Hill Descent
Control (HDC)
If equipped, Hill Descent Control
(HDC) sets and maintains vehicle
speed while driving down steep
grades in a forward or reverse gear.
The HDC switch is on the center
stack, below the climate controls.
Press
5to enable or disable HDC.
Vehicle speed must be below
50 km/h (31 mph).
When enabled, the HDC light
displays on the instrument cluster.
A blinking HDC light indicates the
system is actively applying the
brakes to maintain vehicle speed.
HDC can maintain vehicle speeds
between 1 and 30 km/h (1 and
19 mph) on grades greater than or
equal to 10%. If HDC is to be used for more than
three minutes or on grades steeper
than 25%, the transfer case should
be put into Four-Wheel Drive Low
(4
n) to reduce the possibility of
brake overheating.
Noise from the hydraulic brake
control module is normal when HDC
is active.
When HDC is activated, the initial
HDC speed is set to the current
driving speed. It can be increased or
decreased by pressing +RES or
SET- on the steering wheel, or by
applying the accelerator or brake
pedal. This adjusted speed
becomes the new set speed.
HDC will remain enabled between
30 and 60 km/h (19 and 37 mph);
however, vehicle speed cannot be
set or maintained in this range. HDC
will automatically disable if the
vehicle speed is above 80 km/h
(50 mph) or above 60 km/h
(37 mph) for at least 30 seconds.
5must be pressed again to
re-enable HDC. HDC may disable
after an extended period of use. If this happens, HDC will require
time to cool down. The length of
time HDC remains active depends
on road conditions, grade, set
speed, vehicle loading, and outside
temperature.
When enabled, if the vehicle speed
is above 30 km/h (19 mph) and
below 60 km/h (37 mph), a DIC
message will display.
Magnetic Ride Control
This vehicle may have a semi-active
damping system called Magnetic
Ride Control. With this feature,
improved vehicle ride and handling
is provided under a variety of
passenger and loading conditions.
Magnetic Ride Control is fully
automatic and uses a computer
controller to continuously monitor
vehicle speed, wheel to body
position, lift/dive, and steering
position of the vehicle. The
controller then sends signals to
each shock absorber to

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
264 Driving and Operating
.The trailer must be equipped
with brakes adequate for the
intended use. A loaded trailer
weighing more than 900 kg
(2,000 lb) must be equipped with
its own brake system, with
brakes working on all axles.
Trailer braking equipment
conforming to Canadian
Standards Association (CSA)
requirement CAN3-D313, or its
equivalent, is recommended.
. Do not tow a trailer during the
first 800 km (500 mi) to prevent
damage to the engine, axle,
or other parts.
. Then during the first 800 km
(500 mi) of trailer towing, do not
drive over 80 km/h (50 mph) and
do not make starts at full throttle.
. Vehicles can tow in D (Drive).
Shift the transmission to a lower
gear if the transmission shifts
too often under heavy loads and/
or hilly conditions.
. Do not use Adaptive Cruise
Control when towing. .
Turn off Parking Assist and Rear
Cross Traffic Alert (RTCA) when
towing.
. The Forward Automatic Braking
System should be set to Off
when towing. See Forward
Automatic Braking (FAB) 022.
. Turn off Lane Keep Assist (LKA)
when towing. See Lane Keep
Assist (LKA) 0257.
{Warning
When towing a trailer, exhaust
gases may collect at the rear of
the vehicle and enter if the
liftgate, trunk/hatch, or rear-most
window is open.
When towing a trailer:
. Do not drive with the
liftgate, trunk/hatch,
or rear-most window open.
. Fully open the air outlets on
or under the instrument
panel.
(Continued)
Warning (Continued)
.Also adjust the climate
control system to a setting
that brings in only outside
air. See “Climate Control
Systems” in the Index.
For more information about
carbon monoxide, see Engine
Exhaust 0219.
Towing a trailer requires a certain
amount of experience. The
combination you are driving is
longer and not as responsive as the
vehicle itself. Get acquainted with
the handling and braking of the rig
before setting out for the open road.
The structure, tires, and brakes of
the trailer must be rated to carry the
load. Inadequate trailer equipment
can cause the combination to
operate in an unexpected or unsafe
manner.
Before starting, check all trailer hitch
parts and attachments, safety
chains, electrical connectors, lamps,

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
342 Vehicle Care
Warning (Continued)
developed for the vehicle, and
have them properly installed by a
GM certified technician.
See Buying New Tires 0340 and
Accessories and Modifications
0 282.
Uniform Tire Quality
Grading
The following information relates
to the system developed by the
United States National Highway
Traffic Safety Administration
(NHTSA), which grades tires by
treadwear, traction, and
temperature performance. This
applies only to vehicles sold in
the United States. The grades
are molded on the sidewalls of
most passenger car tires. The
Uniform Tire Quality Grading
(UTQG) system does not apply
to deep tread, winter tires, compact spare tires, tires with
nominal rim diameters of
10 to 12 inches (25 to 30 cm),
or to some limited-production
tires.
While the tires available on
General Motors passenger cars
and light trucks may vary with
respect to these grades, they
must also conform to federal
safety requirements and
additional General Motors Tire
Performance Criteria (TPC)
standards.
Quality grades can be found
where applicable on the tire
sidewall between tread shoulder
and maximum section width. For
example:
Treadwear 200 Traction AA
Temperature A
All Passenger Car Tires Must
Conform to Federal Safety
Requirements In Addition To
These Grades.
Treadwear
The treadwear grade is a
comparative rating based on the
wear rate of the tire when tested
under controlled conditions on a
specified government test
course. For example, a tire
graded 150 would wear one and
one-half (1½) times as well on
the government course as a tire
graded 100. The relative
performance of tires depends
upon the actual conditions of
their use, however, and may
depart significantly from the
norm due to variations in driving
habits, service practices and
differences in road
characteristics and climate.
Traction
The traction grades, from
highest to lowest, are AA, A, B,
and C. Those grades represent
the tire's ability to stop on wet
pavement as measured under
controlled conditions on

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-11349262) - 2018 - CRC - 11/3/17
420 Index
Check (cont'd)Ignition Transmission Lock . . . 307
Child Restraints Infants and Young Children . . . 101
Lower Anchors and Tethers
for Children . . . . . . . . . . . . . . . . . 107
Older Children . . . . . . . . . . . . . . . . 100
Securing . . . . . . . . . . . . .115, 117, 118
Systems . . . . . . . . . . . . . . . . . . . . . . 104
Child-View Mirror . . . . . . . . . . . . . . . . 57
Circuit Breakers . . . . . . . . . . . . . . . . 313
Cleaning Exterior Care . . . . . . . . . . . . . . . . . 365
Interior Care . . . . . . . . . . . . . . . . . . 369
Climate Control Systems Dual Automatic . . . . . . . . . . . . . . . 184
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Cluster, Instrument . . . . . . . . . . . . . 136
Collision Damage Repair . . . . . . . 399
Compartments
Storage . . . . . . . . . . . . . . . . . . . . . . . 121
Compass . . . . . . . . . . . . . . . . . . . . . . . 129
Connections
OnStar . . . . . . . . . . . . . . . . . . . . . . . 409
Control Hill Descent . . . . . . . . . . . . . . . . . . 236 Control (cont'd)
Traction and Electronic
Stability . . . . . . . . . . . . . . . . . . . . . 234
Control of a Vehicle . . . . . . . . . . . . . 194
Convenience Net . . . . . . . . . . . . . . . 123
Convex Mirrors . . . . . . . . . . . . . . . . . . 54
Coolant
Engine Temperature Gauge . . 141
Engine TemperatureWarning Light . . . . . . . . . . . . . . . 151
Cooling . . . . . . . . . . . . . . . . . . . . 184, 188
Cooling System . . . . . . . . . . . . . . . . . 295
Courtesy Transportation Program . . . . . . . . . . . . . . . . . . . . . . . 398
Cruise Control . . . . . . . . . . . . . . . . . . 237 Light . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Cruise Control, Adaptive . . . . . . . . 240
Cupholders . . . . . . . . . . . . . . . . . . . . . 121
Customer Assistance . . . . . . . . . . . 395 Offices . . . . . . . . . . . . . . . . . . . . . . . . 394
Text Telephone (TTY)Users . . . . . . . . . . . . . . . . . . . . . . . 395
Customer Information
Service PublicationsOrdering Information . . . . . . . . 401
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . 392D
Damage Repair, Collision . . . . . . . 399
Danger, Warning, and Caution . . . . 3
Data CollectionInfotainment System . . . . . . . . . . 405
OnStar . . . . . . . . . . . . . . . . . . . . . . . 405
Data Recorders, Event . . . . . . . . . 404
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . 177
Defensive Driving . . . . . . . . . . . . . . . 194
Delayed Locking . . . . . . . . . . . . . . . . . 43
Diagnostics
OnStar . . . . . . . . . . . . . . . . . . . . . . . .411
Distracted Driving . . . . . . . . . . . . . . . 193
Dome Lamps . . . . . . . . . . . . . . . . . . . 180
Door
Ajar Light . . . . . . . . . . . . . . . . . . . . . 154
Delayed Locking . . . . . . . . . . . . . . . . 43
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Power Locks . . . . . . . . . . . . . . . . . . . . 43
Drive Belt Routing, Engine . . . . . . 391
Driver Assistance Systems . . . . . 247
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . 154
Driving Assistance Systems . . . . . . . . . . 250
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . 263