2002 GMC YUKON XL DENALI climate control

2-28
Engine Exhaust
CAUTION:
Engine exhaust can kill. It contains the gas
carbon monoxide (CO), which you can't see or
smell. It can cause unconsciousness and death.
You might have exhaust coming in if:

Your exhaust system sounds strange
or different.

Your vehicle gets rusty underneath.

Your vehicle was damaged in a collision.

Your vehicle was damaged when driving over
high points on the road or over road debris.

Repairs weren't done correctly.

Your vehicle or exhaust system had been
modified improperly.
If you ever suspect exhaust is coming into
your vehicle:

Drive it only with all the windows down to
blow out any CO; and

Have your vehicle fixed immediately.
Running Your Engine While
You're Parked
It's better not to park with the engine running. But if you
ever have to, here are some things to know.
CAUTION:
Idling the engine with the climate control
system off could allow dangerous exhaust into
your vehicle. See the earlier Caution under
ªEngine Exhaust.º
Also, idling in a closed-in place can let deadly
carbon monoxide (CO) into your vehicle even
if the fan is at the highest setting. One place
this can happen is a garage. Exhaust
-- with
CO
-- can come in easily. NEVER park in a
garage with the engine running.
Another closed-in place can be a blizzard. See
ªBlizzardº in the Index.

3-
3-1
Section 3 Comfort Controls and Audio Systems
In this section, you'll find out how to operate the comfort control and audio systems offered with your vehicle.
Be sure to read about the particular systems supplied with your vehicle.
3
-2 Comfort Controls
3
-2 Electronic Climate Control System
3
-8 Air Conditioning
3
-8 Heating
3
-9 Defogging and Defrosting
3
-9 Rear Window Defogger
3
-10 Ventilation System
3
-11 Audio Systems
3
-11 Setting the Clock
3
-12 AM-FM Stereo with Cassette Tape
Player (Bose
)3
-17 Rear Seat Audio (RSA)
3
-19 Compact Disc Changer
3
-22 Theft-Deterrent Feature
3
-24 Audio Steering Wheel Controls
3
-25 Understanding Radio Reception
3
-25 Tips About Your Audio System
3
-26 Care of Your Cassette Tape Player
3
-27 Care of Your Compact Discs
3
-27 Care of Your Compact Disc Player
3
-27 Fixed Mast Antenna

3-2
Comfort Controls
Electronic Climate Control System
Fan Knob
The knob on the left side of the electronic climate
control panel regulates the fan speed. To manually
increase airflow, turn the knob clockwise. To manually
decrease airflow, turn it counterclockwise.
OFF: If the knob is in OFF, outside air will still enter
the vehicle, and will be directed based on the position of
the mode knob.AUTO (Automatic): If the knob is in AUTO, the
fan speed will vary as the system maintains the
selected temperature.
When both the fan knob and mode knobs are in the
AUTO position, the system will then automatically
maintain the desired cabin temperature selected.
Manual operation is also available.
Temperature Knob
The middle knob on the control panel lets you select the
desired air temperature in your vehicle. Turn the knob
clockwise toward 82 for warmer air. Turn the knob
counterclockwise toward 66 for cooler air. When the
system is set for automatic operation, sensors will
regulate the fan speed.
(Full hot): If you turn the temperature knob past 82
F
(28
C), the system will go into the ªfull hotº mode.
The system will remain at that maximum heating setting
and the fan will blow at the speed to which the fan knob
is set. If the fan is in AUTO, it will run at full speed.
(Full cold): If you turn the temperature knob past 66
F
(19
C), the system will go into the ªfull coldº mode.
The system will remain at that maximum cooling setting
and the fan will blow at the speed to which the fan knob
is set. If the fan is in AUTO, it will run at full speed.

3-3
Mode Knob - Manual Operation
The right knob on the control panel allows you to
choose the direction of air delivery.
You can choose to set the climate control system
operations manually, or let the system work
automatically by turning the knob on the control panel
to AUTO. See ªMode Knob
-- Automatic Operationº
later in this section.
(Vent): This setting directs most of the air through
the instrument panel outlets and a small amount through
the floor outlets.
(Bi-level): This setting directs air through the
floor outlets as well as the instrument panel outlets.
(Floor): This setting directs most of the airflow
through the floor outlets and some air through the
windshield defroster outlets. Recirculation will not be
available in this mode. See ªRecirculationº following
for more information.
(Blend): This setting divides airflow equally
between the floor outlets and the windshield defroster
outlets. The air conditioning compressor may run to
dehumidify the air to prevent window fogging.
Recirculation will not be available in this mode. See
ªRecirculationº following for more information.
(Defrost): This setting directs most air through the
windshield defroster outlets and some through the floor
outlets. The air conditioning compressor may run to
dehumidify the air to prevent window fogging.
Recirculation will not be available in this mode. See
ªRecirculationº following for more information.
Mode Buttons
(Outside air): Press this button, located
under the fan knob, to use outside air. Using outside
air will limit stale air odors and help to prevent
excessively humid interior air (from wet boots or
clothing or maximum passenger loads) from being
redirected onto windows.
Pressing the outside air button will cancel the
recirculation button.

3-7 Rear Air Conditioning and Heating Systems
with Electronic Climate Control System
(Without Sunroof)
Front Control
Rear ControlWith this system the rear passengers can control the
temperature of the air flow for the rear seating area.
The climate control panels have three knobs.
To adjust the fan speed, turn the fan knob located on
the left side of the control panel to the desired setting.
The system also has a front AUTO setting that can
automatically change the temperature of the rear seating
area based on information received from the front
control panel. The OFF setting, located on the front
climate control panel, also allows the driver to turn off
the rear passenger seat controls from the front seat.
To adjust the air temperature, turn the temperature knob
located on the center of the control panel clockwise
toward 82
F (28
C) for warmer air and
counterclockwise toward 66
F (19
C) for cooler air.
To direct the airflow, turn the right knob located on
the control panel clockwise or counterclockwise to the
desired mode. Generally, the upper vents are used for air
conditioning and the floor vents for heating. The control
knob can be set to any blend setting.
For rear control operation, use the above instructions.

6-48
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
a half (1 1/2) 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
-- AA, A, B, C
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 specified government test surfaces of
asphalt and concrete. A tire marked C may have poor
traction performance. Warning: The traction grade
assigned to this tire is based on straight
-ahead braking
traction tests, and does not include acceleration,
cornering, hydroplaning, or peak traction characteristics.Temperature
-- A, B, C
The temperature grades are A (the highest), B, and C,
representing the tire's resistance to the generation of
heat and its ability to dissipate heat when tested under
controlled conditions on a specified indoor laboratory
test wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life, and
excessive temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance
on the laboratory test wheel than the minimum required
by law.
Warning: The temperature grade for this tire is
established for a tire that is properly inflated and not
overloaded. Excessive speed, underinflation, or
excessive loading, either separately or in combination,
can cause heat buildup and possible tire failure.

6-62
Instrument Panel Fuse Block
The fuse block access door
is on the driver's side edge
of the instrument panel.
Pull off the cover to access
the fuse block.
You can remove fuses with a fuse extractor which is
mounted to the fuse block access door. To remove fuses
if you don't have a fuse extractor, hold the end of the
fuse between your thumb and index finger and pull
straight out.
You may have spare fuses located behind the fuse block
access door. These can be used to replace a bad fuse.
However, make sure it is of the correct amperage.
NAME Usage
HVAC 1 Climate Control System
IGN 3 Ignition, Power Seats
BRAKE Anti
-Lock Brake System
HTR A/C Climate Control System

6-67
Name Usage
STUD #1 Accessory Power/Trailer Wiring
Feed/Load Leveling
ABS Anti
-Lock Brakes
IGN A Ignition Switch
AIR A.I.R. System
RAP #1 Retained Accessory Power,
Power Mirrors, Power Door
Locks, Power Seat(s)
IGN B Ignition Switch
RAP #2 Retained Accessory Power/Rear
Power Windows, Sunroof, Radio
STUD #2 Accessory Power/Trailer Wiring
Brake Feed
TRL R TRN Right Turn Signal Trailer Wiring
TRL L TRN Left Turn Signal Trailer Wiring
IGN 1 Ignition, Fuel Controls
INJ
-B Ignition, Fuel Controls (Relay)Name Usage
STARTER Starter (Relay)
PARK LP Parking Lamps
FRT HVAC Climate Control System
STOP LP Exterior Lamps, Stoplamps
ECM 1 VCM/PCM
CHMSL Center High Mounted Stoplamp
VEH STOP Stoplamps, Cruise Control
TRL B/U Backup Lamps Trailer Wiring
INJ
-A Fuel Controls, Ignition
RR HVAC Rear Climate Control System
VEH B/U Vehicle Backup Lamps
ENG 1 Engine Controls, Canister Purge,
Fuel System
ETC Electronic Throttle Control
IGN E A/C Compressor Relay, Rear
Window Defogger, Daytime
Running Lamps, A.I.R. System