2007 GMC YUKON XL DENALI air conditioning

To replace the battery in the RKE transmitter do
the following:
1. Use a at object with a thin edge into the
notch, located below the trunk release
button, and separate the bottom half from
the top half of the transmitter.
2. Remove the old battery, but do not use a
metal object to do this.
3. Slide the new battery into the transmitter with
the positive side of the battery facing down.
Use a type CR2032 battery, or equivalent
type. Make sure the cover is on tightly,
so water will not get in.
4. Snap the front and the back of the transmitter
together.
5. Test the operation of the transmitter with the
vehicle.
Remote Vehicle Start
Your vehicle may have a remote starting feature.
This feature allows you to start the engine from
outside of the vehicle. It may also start up the
vehicle’s heating or air conditioning systems and
rear window defogger. Normal operation of the
system will return after the key is turned to the
RUN position.If your vehicle has an automatic climate control
system, during remote start, the climate control
system will default to a heating mode during colder
outside temperatures and a cooling mode during
warmer outside temperatures. If your vehicle
does not have an automatic climate control
system, during remote start the climate control
system will turn on at the setting the vehicle was
set to when the vehicle was last turned off.
Laws in some communities may restrict the use of
remote starters. For example, some laws may
require a person using the remote start to have
the vehicle in view when doing so. Check
local regulations for any requirements on remote
starting of vehicles.
Do not use the remote start feature if your vehicle
is low on fuel. Your vehicle may run out of fuel.
The RKE transmitter with the remote start button,
provides an increased range of operation. However,
the range may be less while the vehicle is running.
As a result, you may need to be closer to your
vehicle to turn it off, than you were to turn it on.
There are other conditions which can affect the
performance of the transmitter, seeRemote
Keyless Entry System on page 114for additional
information.
119

Instrument Panel Overview........................ 190
Hazard Warning Flashers.......................... 192
Other Warning Devices............................. 192
Horn.......................................................... 192
Tilt Wheel.................................................. 193
Turn Signal/Multifunction Lever.................. 193
Turn and Lane-Change Signals................. 194
Headlamp High/Low-Beam Changer.......... 195
Flash-to-Pass............................................ 195
Windshield Wipers..................................... 196
Rainsense™ II Wipers............................... 197
Windshield Washer.................................... 198
Rear Window Wiper/Washer...................... 199
Cruise Control........................................... 200
Exterior Lamps.......................................... 203
Headlamps on Reminder........................... 205
Daytime Running Lamps (DRL)................. 205
Automatic Headlamp System..................... 205
Fog Lamps................................................ 206
Instrument Panel Brightness...................... 207
Dome Lamps............................................. 207
Dome Lamp Override................................ 207
Entry Lighting............................................ 207
Exit Lighting.............................................. 207Front Reading Lamps................................ 208
Battery Run-Down Protection..................... 208
Ultrasonic Rear Parking Assist (URPA)...... 208
Accessory Power Outlet(s)........................ 213
Ashtray(s) and Cigarette Lighter................ 214
Climate Controls......................................... 214
Dual Automatic Climate Control System....... 214
Outlet Adjustment...................................... 222
Rear Air Conditioning and Heating
System and Electronic Climate
Controls................................................. 223
Warning Lights, Gages, and Indicators..... 225
Instrument Panel Cluster........................... 226
Speedometer and Odometer...................... 227
Trip Odometer........................................... 227
Tachometer............................................... 227
Safety Belt Reminder Light........................ 228
Passenger Safety Belt Reminder Light....... 228
Airbag Readiness Light............................. 229
Passenger Airbag Status Indicator............. 230
Charging System Light.............................. 232
Voltmeter Gage......................................... 232
Brake System Warning Light..................... 233
Section 3 Instrument Panel
187

Automatic Operation
AUTO (Automatic):When automatic operation
is active the system will control the inside
temperature, the air delivery, and the fan speed.
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 temperature(s)
and AUTO will be lit on the display. The current
delivery mode and fan speed will also be
displayed for approximately 5 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 about
40°F (4°C). The air inlet will normally be set to
outside air. If it is 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.2. Set the driver’s and passenger’s temperature.
To nd your comfort setting, start with a 74°F
(23°C) temperature setting and allow about
20 minutes for the system to regulate. Use the
driver’s or passenger’s temperature buttons 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 solar 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. For more information on the solar
sensor, see “Sensors” later in this section.
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.
216

O(On/Off):Press this button to turn off the
climate control system. Outside air will still enter
the vehicle, and will be directed to the oor.
This direction can be changed by pressing the
mode button. Recirculation can be selected once
you have selected vent or bi-level mode. The
temperature can also be adjusted using either
temperature button. If you adjust the air delivery
mode or temperature settings with the system
off, the display will illuminate briey to show you
the settings and then return off. Press the
on/off button or the up down arrows on the fan
switch, the defrost button, AUTO button, or the air
conditioning button to turn the system on when
it is off.
Manual Operation
You may manually adjust the air delivery mode or
fan speed.
y9 z(Fan):The buttons with the fan symbols
allow you to manually adjust the fan speed.
Press the up arrow to increase fan speed and the
down arrow to decrease fan speed.Pressing one of these buttons when the system
is off will turn the system on. Pressing one of these
buttons when in automatic control will place the
fan under manual control. The fan setting will
remain displayed and the AUTO light will turn off.
The air delivery mode will remain under
automatic control.
yNz(Mode):Press the mode up and down
buttons to manually change the direction of
the airow in your vehicle. Repeatedly press the
button until the desired mode appears on the
display. Pressing one of these buttons when the
system is off will change air delivery mode without
turning the system on. Pressing one of these
buttons when in automatic control will place the
mode under manual control.
The air delivery mode setting will be displayed and
the AUTO light will turn off. The fan will remain
under automatic control.
217

H(Vent):This setting will deliver air to the
instrument panel outlets.
)(Bi-Level):This mode directs half of the air
to the instrument panel outlets and to the oor
outlets. The ow can be divided between vent and
oor outlets depending upon where the knob is
placed between the settings. A little air is directed
towards the windshield and side window outlets.
Cooler air is directed to the upper outlets and
warmer air to the oor outlets.
6(Floor):This mode directs most of the air to
the oor outlets, with some of the air directed
to the windshield, side window outlets, and
second row oor outlets. In this mode, the system
will automatically select outside air.
-(Defog):See “Defogging and Defrosting” later
in this section.
@(Recirculation):Press this button to turn
the recirculation mode on. When the button
is pressed, an indicator light will come on.
This mode keeps outside air from entering the
vehicle. It can be used to reduce outside air and
prevent odors from entering your vehicle.
Recirculation may also help cool the air inside your
vehicle more quickly once the temperature inside
the vehicle is less than the outside temperature.
The recirculation mode cannot be used with oor,
defrost, or defogging modes. If you try to select
recirculation in one of those modes, the indicator
will ash three times and turn off. The air
conditioning compressor will also come on when
this mode is activated. While in recirculation mode
the windows may fog when the weather is cold and
damp. To clear the fog, select either the defog or
defrost mode and increase the fan speed.
Recirculation mode can be turned off by pressing
the button again, or turning off the engine.
218

Air Conditioning
#
(Air Conditioning):Press this button to turn
the air conditioning (A/C) compressor on and
off. When air conditioning is selected, an indicator
light will come on to let you know that the air
conditioning has been activated.
Pressing this button when the outside temperature
is too cool for air conditioning will make the air
conditioning indicator ash three times and
then turn off to let you know the air conditioning
mode is not available. If the air conditioning
is on and the outside temperature drops below a
temperature which is too cool for air conditioning
to be effective, the air conditioning light will turn off
to let you know the air conditioning mode has
been canceled.
On hot days, open the windows long enough to let
hot inside air escape. This helps to reduce the
time it takes for your vehicle to cool down. It also
helps the system to operate more efficiently.
The air conditioning system removes moisture from
the air, so you may sometimes notice a small
amount of water dripping underneath your vehicle
while idling or after turning off the engine. This
is normal.
Sensors
The solar sensor, located in the defrost grille in
the middle of the instrument panel, monitors
the solar radiation. Do not cover the solar sensor
or the system will not work properly.
219

Defogging and Defrosting
Fog on the inside of the windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate control
system is used properly. There are two modes to
clear fog or frost from your windshield.
Use the mode up and down arrows to select the
defog or defrost modes.
-(Defog):The defog mode is used to clear
the windows of fog or moisture and warm
the passengers. This mode directs air to the
windshield, oor outlets, and side window vents.
When you select this mode, the system turns
off recirculation and runs the air conditioning
compressor unless the outside temperature is
close to freezing. The recirculation mode cannot
be selected while in the defog mode. Do not drive
the vehicle until all the windows are clear.
0(Defrost):Press this button to remove fog or
frost from the windshield more quickly. This
mode directs a portion of the air to the windshield
and side window vents and some to the oor
vents. In this mode, the system will automatically
force outside air into your vehicle. The
recirculation mode cannot be selected while in the
defrost mode. The air conditioning compressor
will run automatically in this setting, unless
the outside temperature is close to freezing. Do
not drive the vehicle until all the windows are clear.
221

Adding outside equipment to the front of your
vehicle, such as hood-air deectors, 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 Air Conditioning and Heating
System and Electronic Climate
Controls
If your vehicle has this system, the rear heat and
air conditioning controls are integrated with the
rear seat audio controls located in the center
console. The system can be controlled from the
front controls as well as the rear controls.
When the rear system is on, the front control head
AUX button indicator will be illuminated. Pressing
the front control head AUX button the rst time
will turn the rear system on in a mimic mode.
In this mode, the airow in the rear will be
approximately the same direction, temperature,
and fan speed as the front. Pressing the AUX
button again will turn the rear system and
the indicator off.At anytime, if the rear controls are adjusted, the
system will enter a rear independent mode. Airow
in the rear will then be directed according to the
settings of rear controls. At anytime the rear system
can be turned off by pressing the front control head
AUX button and turning the indicator off.
If the indicator in the front AUX button is off, the
rear system is off.
Rear Climate Controls with Rear Seat Audio Controls
223