air conditioning GMC YUKON DENALI 2003 Owners Manual

Turn the knob counterclockwise or clockwise to lower or
increase the cabin temperature. The display will show
the temperature setting decreasing or increasing and an
arrow pointing
to the passenger will be displayed
under and
to the right of the temperature setting.
The passenger’s temperature setting can be set
to
match the driver’s temperature setting by pressing and
holding the AUTO button for four seconds. Both the
driver and passenger arrows will be displayed.
Automatic Operation
AUTO (Automatic): When automatic operation is
active the system will control the inside temperature, the
air delivery, and the fan speed.
0 (Off): Press this button to turn off the entire climate
control system. Outside air will still enter the vehicle,
and will be directed
to the floor. This direction can
be changed by pressing the mode button. The
temperature can also be adjusted using either
temperature knob. Press the up or down arrows on the
fan switch, the defrost button, the AUTO button, or
the air conditioning button
to turn the system on when it
is off.
Use the steps below to place the entire system in
automatic mode:
1. Press the AUTO button.
When AUTO is selected, the display will change
to
show the current driver’s set temperature, delivery
mode and fan speed. Press the AUTO button again
within five seconds
to display the passenger’s set
temperature.
If the driver and passenger’s temperature settings
are not the same, the opposite side temperature
setting will be displayed for an additional five
seconds. To make the passenger’s temperature the
same as the driver’s press and hold the AUTO
button for approximately four seconds.
When auto is selected, the air conditioning operation
and air inlet will be automatically controlled. The
air conditioning compressor will run when the
outside temperature is over approximately
40°F
(4°C). The air inlet will normally be set to outside air.
If it’s hot outside, the air inlet may automatically
switch
to recirculate inside air to help quickly cool
down your vehicle. The light on the button will
illuminate in recirculation.
3-20

2. Set the driver’s and passenger’s temperature.
To find your comfort setting, start with a
74°F (23°C)
temperature setting and allow about
20 minutes
for the system to regulate. Turn the driver’s or
passenger’s side temperature knob
to adjust the
temperature setting as necessary.
If you choose the temperature setting of 60°F
(15°C) the system will remain at the maximum
cooling setting.
If you choose the temperature
setting of
90°F (32°C) the system will remain at the
maximum heat setting. Choosing either maximum
setting will not cause the vehicle to heat or cool
any faster.
Be careful not to cover the sensor located on the
top of the instrument panel near the windshield. This
sensor regulates air temperature based on sun
load, and also turns on your headlamps.
To avoid blowing cold air in cold weather, the
system will delay turning on the fan until warm air is
available. The length of delay depends on the
engine coolant temperature. Pressing the fan switch
will override this delay and change the fan to a
selected speed.
Manual Operation
You may manually adjust the air delivery mode or
fan speed.
0 (Off): Press this button to turn off the entire climate
control system. Outside air will still enter the vehicle, and
will be directed
to the floor. This direction can be changed
by pressing the mode button. The temperature can also
be adjusted using either temperature knob. Press the up
or down arrows on the fan switch, the defrost button, the
AUTO button, or the air conditioning button to turn the
system on when it is
off.
v (Fan): The switch with the fan symbol allows
you
to manually adjust the fan speed. Press the up
arrow
to increase fan speed and the down arrow
to decrease fan speed.
Pressing this button when the system
is off will turn the
system on.
% *d (Mode): Press this button to manually change the
direction of the airflow in your vehicle; keep pressing the
button until the desired mode appears on the display.
If you press the mode button to select an air delivery
mode, the display will change to show you the selected
air mode delivery. The display will then show the
current status of the system. When the system is turned
off, the display will go blank after displaying the
current status of the system.
3-21

2 (Panel): This setting will deliver air to the
instrument panel outlets.
+2 (Bi-Level): This setting will deliver warmer air to the
floor and cooler air
to the instrument panel outlets.
(Floor): This setting will deliver air to the floor
outlets.
+3 (Defog): See “Defogging and Defrosting” later in
this section.
(Recirculation): Press this button to limit the
amount of outside air entering your vehicle. The light on
the recirculation button will glow. This is helpful when
you are trying
to limit odors entering your vehicle and for
maximum air conditioning performance in hot weather.
Press this button again to allow outside air to enter
the vehicle. The light on the recirculation button
will go
off.
Pressing this button cancels the auto recirculation
feature.
To resume the auto recirculation function, press
the AUTO button. Each time the vehicle is started,
the system will revert
to the auto recirculation function.
If you select recirculation while in defrost, defog or
floor, the light on the button will flash and go out
to let
you know this is not allowed. This is
to prevent fogging. When
the weather is cool or damp, operating the
system in recirculation for extended periods of time may
cause fogging of the vehicle’s windows.
To clear the
fog, select either defog or front defrost. Be sure
A/C off
is not selected. You will want to allow the air
conditioning
to run automatically to help dehumidify
the air.
Display
If you press the MODE button to select an air delivery
mode, the display will change to show you the selected
air delivery mode. After ten seconds, the display will
change to show the driver temperature setting and the
selected mode.
If you press the up or down arrows on the fan switch,
the display will change to show the selected fan speed.
After ten seconds, the display will change
to show
the driver temperature setting and the selected mode.
Whenever you press AUTO, the display will change
to show the following:
the current driver’s set temperature and an arrow
for five seconds,
the current passenger’s set temperature setting and
an arrow for five seconds and
0 the automatic air delivery mode and fan speed.
3-22

If the driver’s and passenger’s temperature settings are
the same when AUTO
is pressed, the temperature
setting and both arrows will be displayed for five
seconds along with the automatic air delivery mode and
fan speed. After the five second update, the display
will change to show the temperature setting, both arrows
and AUTO.
Air Conditioning
a (Air Conditioning): Press this button to turn the air
conditioning compressor on and
off.
% (Air Conditioning Off): When you turn the air
conditioning
off, this symbol will appear on the display.
When air conditioning is selected or in AUTO mode,
the system will run the air conditioning automatically to
cool and dehumidify the air entering the vehicle.
If
you select A/C off while in front defrost or defog, the
A/C off symbol will flash to let you know this is not
allowed. This is
to prevent fogging.
On hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for
your vehicle to cool down. Then keep your windows
closed for the air conditioner to work its best. On
cool, but sunny days while using manual operation
of the automatic system, use bi-level
to deliver warm
air to the floor and cooler air to the instrument
panel outlets. To warm or cool the air delivered, turn the
temperature knob to the desired setting.
In AUTO mode the system will cool and dehumidify the
air inside the vehicle. Also while in AUTO mode, the
system will maximize its performance by using
recirculation as necessary.
Heating
On cold days when using manual operation of the
automatic system, choose floor mode to deliver air to
the floor outlets. To warm or cool the air delivered, turn
the temperature knob to the desired setting.
If you want to use the automatic mode, press
AUTO and adjust the temperature by turning the
temperature knob.
The heater works best
if you keep the windows closed
while using it.
3-23

Defogging and Defrosting
You can use either defog or front defrost to clear fog or
frost from your windshield. Use the defog mode
to
clear the windows of fog or moisture. Use the front
defrost button to defrost the front windshield.
(Defog): Use this setting to clear the windows of fog
or moisture. Press the mode button to select this
setting. This setting will deliver air
to the floor and
windshield outlets.
@ (Front Defrost): Press the front defrost button to
defrost the windshield. The system will automatically
control the fan speed
if you select defrost from AUTO
mode. If the outside temperature is
40°F (4°C) or
warmer, your air conditioning compressor will
automatically run
to help dehumidify the air and dry the
windshield.
Rear Window Defogger
The lines you see on the rear window warm the glass.
The rear window defogger uses a warming grid
to
remove fog from the rear window.
(Rear): Press this button to turn the rear window
defogger on or
off. An indicator light in the button
will come on to let you know that the rear window
defogger is activated.
The rear window defogger will turn
off approximately
10 minutes after the button is pressed. If you need
additional warming time, press the button again.
If your vehicle is equipped with heated mirrors this
button will activate them.
Notice: Don’t use a razor blade or something else
sharp on the inside of the rear window. If you
do, you could cut or damage the defogger and the
repairs would not be covered by your warranty.
Do not attach a temporary vehicle license, tape, a
decal or anything similar to the defogger grid.
3-24

Outlet Adjustment
Use the air outlets located in the center and on the side
of your instrument panel to direct the airflow.
Your vehicle has air outlets that allow you to adjust the
direction and amount of airflow inside the vehicle.
Move the louvers up or down. Use the thumbwheel next
to or underneath the outlet
to close the louvers. For
the most efficient airflow and temperature control, keep
the outlet in the fully opened position.
Operation Tips
e
e
Keep the hood and front air inlets free of ice, snow,
or any other obstruction (such as leaves). The
heater and defroster will work far better, reducing
the chance of fogging the inside of your windows.
Keep the air path under the front seats clear
of objects. This helps air to circulate throughout
your vehicle.
Adding outside equipment
to the front of your
vehicle, such as hood-air deflectors, etc., may affect
the performance of the heating and air conditioning
system. Check with your dealer before adding
equipment to the outside of your vehicle.
Rear Climate Control System
With this system the front or rear passengers can
control the air temperature, air flow and fan speed for
the rear seat passengers. The climate control has
an overhead control near the driver and a control on the
back of the center console.
Driver Overhead Control
I/
I
Front Controls
To control the rear climate control from the front seat
position, use the driver overhead control. The rear
console control must be on.
3-25

AUX: Turn the knob, located on the left side of the
control panel, to this position
to allow the rear seat
passengers
to have control over the rear climate control
system. See “Rear Passenger Console Control’’ later
for more information.
0 (Off): Turn the knob, located on the left side of the
control panel,
to this position to turn the rear climate
control system
off.
@ (Fan): To adjust the airflow speed, turn the fan
knob located on the left side of the control panel
to the
desired setting. Choose AUTO
if you want the system
to automatically choose the fan speed to maintain
a selected temperature. See “Auto Mode” later in this
section for more information on using this feature.
“F (“C): To adjust the air temperature, turn the
temperature knob on the center of the control panel. For
cooler or warmer air turn the knob counterclockwise
toward
66°F (1 9°C) or clockwise toward 82°F (27°C).
To regulate the airflow direction, adjust the right knob on
the control panel. Turn the knob clockwise for floor
vent airflow or counterclockwise for headliner vent
airflow. Generally, the upper vents are used for air
conditioning and the floor vents for heating. The knob
can be set
to any blend setting. Choose AUTO if
you want the system to automatically regulate the
airflow. See “Auto Mode” later in this section for more
information on using this feature.
Rear Passenger Console Control
To control the rear climate control from the rear
passenger seat position, use the rear passenger console
control. The driver overhead control fan knob must be
set
to the AUX position.
Rear Controls
The rear seat controls have the following settings:
0 (OnIOff): Press this button to turn the rear seat
Comfort controls on or
off when the front overhead
control is set
to AUX.
3-26

Fuses
RR HVAC
Usage
Rear Climate Control
AUX PWR I
Auxiliary Power
Outlet
- Console
IGN
1
PCM 1 Ignition Relay
Electronic Throttle Control,
ETC/ECM Powertrain Control Module
Electronic Brake Controller
IGN E Instrument Panel Cluster,
Air
Conditioning Relay, Turn
SignaVHazard Switch, Starter
Relav
RTD I Ride Control I
TRL B/U
~~
I Backup LampsTrailG Wiring 1
PCM B I
Powertrain Control Module,
Fuel Pumr,
I I
F/PMP I Fuel Pump (Relay)
B/U LP
I
Back-up Lamps, Automatic
Transmission Shift Lock
I
Control System
RR DEFOG
Rear Window Defoaaer
HDLP-HI
~~~ ____
HeadlampHighBeam Relay
PRIME Not Used
Fuses I Usage I
SIR Supplemental Inflatable
Restraint System
FRT PARK
DRL Front Parking Lamps,
Sidemarker Lamps
Daytime Running Lamps
(Relav)
SEO IGN
Truck Body Controller Ignition
TBC IGN1 Rear
Defog Relay
HI HDLP-LT High
Beam Headlamp-Left
LH HID Not
Used
DRL
I Davtime Runnina LamDs I
Instrument Panel
IPC/DIC Cluster/Driver Information
HI HDLP-RT
HDLP-LOW High
Beam Headlamp-Right
Headlamp Low Beam Relav
A/C COMP
I Air Conditionina Comm-essor I v
A/C COMP Air
Conditioning Compressor
Relav
5-94

Capacities and Specifications (cont’d)
I r
Application
Air Conditioning Refrigerant R-l34a
Yukon Denali
Yukon
XL Denaii
I
Capacities ~
English
2.71 Ibs.
3.0 Ibs.
t
Metric
1.23 kg
1.36 kg
1
Wheels and Tires
5-97

Part C: Periodic Maintenance
Inspections
Listed in this part are inspections and services which
should be performed at least twice a year (for instance,
each spring and fall).
You should let your dealer’s
service department or other qualified service center do
these jobs. Make sure any necessary repairs are
completed at once.
Proper procedures
to perform these services may be
found in a service manual. See Service Publications
Ordering Information on page
7- IO.
Steering and Suspension Inspection
Inspect the front and rear suspension and steering
system for damaged, loose or missing parts, signs of
wear or lack of lubrication. Inspect the power steering
lines and hoses for proper hook-up, binding, leaks,
cracks, chafing, etc.
Exhaust System Inspection
Inspect the complete exhaust system. Inspect the body
near the exhaust system. Look for broken, damaged,
missing or out-of-position parts as well as open seams,
holes, loose connections or other conditions which
could cause a heat build-up in the floor pan or could let
exhaust fumes into the vehicle. See Engine Exhaust
on page 2-29.
Fuel System Inspection
Engine Cooling System Inspection
Inspect the complete fuel system for damage or leaks.
Inspect the hoses and have them replaced
if they
are cracked, swollen or deteriorated. Inspect all pipes,
fittings and clamps; replace as needed. Clean the
outside of the radiator and air conditioning condenser.
To help ensure proper operation, a pressure test of
the cooling system and pressure cap is recommended
at least once a year.
Transfer Case and Front Axle
(All-Wheel Drive) Inspection
Every 12 months, or at engine oil change intervals,
check front axle and transfer case and add lubricant
when necessary.
A fluid loss could indicate a problem.
Check and have it repaired,
if needed. Check vent
hose at transfer case for kinks and proper installation.
Brake System Inspection
Inspect the complete system. Inspect brake lines and
hoses for proper hook-up, binding, leaks, cracks,
chafing, etc. Inspect disc brake pads for wear and rotors
for surface condition. Inspect other brake parts,
including calipers, parking brake, etc. You may need
to
have your brakes inspected more often if your driving
habits or conditions result in frequent braking.
6-1 4