GMC Yukon XL 2015 Owner's Manual page 208

Changing the mode cancels the
automatic operation and the system
goes into manual mode. Press
AUTO to return to automatic
operation.
(Vent): Air is directed to the
instrument panel outlets.
(Bi-Level): Air is divided
between the instrument panel and
floor outlets.
(Floor): Air is directed to the
floor outlets, with some to the
windshield, side window outlets, and
second row floor outlets.
-
(Defog): This mode clears the
windows of fog or moisture. Air is
directed to the windshield, floor
outlets, and side window vents.
0
(Defrost): Press to clear the
windshield of fog or frost more
quickly. Air is directed to the
windshield and the side window
vents. The system automatically
forces outside air into the vehicle
and the air conditioning compressor
will run, unless the outside
temperature is close to freezing.
Do not drive the vehicle until all
windows are clear.
See Air Vents on page 8-6.
A/C (Air Conditioning): Press to
turn the air conditioning system on
or off. An indicator light comes on to
show that the air conditioning is
enabled. If the fan is turned off, the
air conditioner will not run. The A/C
light will stay on even if the outside
temperatures are below freezing.
@
(Recirculation): Press to turn
on recirculation. An indicator light
comes on. Air is recirculated to
quickly cool the inside of the
vehicle. It can also be used to help
reduce outside air and odors that
enter the vehicle. The air
conditioning compressor also comes
on when this mode is activated.
Auto Defog: The climate control
system may have a sensor to
automatically detect high humidity
Climate Controls
inside the vehicle. When high
humidity is detected, the climate
control system may adjust to
outside air supply and turn on the
air conditioner. If the climate control
system does not detect possible
window fogging, it returns to normal
operation. To turn Auto Defog off or
on, see Climate and Air Quality
under Vehicle Personalization on
page 5-44.
Rear Window Defogger
The rear window defogger uses a
warming grid to remove fog from the
rear window.
(Rear Window Defogger):
Press to turn the rear window
defogger on or off. An indicator light
on the button comes on to show that
the rear window defogger is on.
The rear window defogger only
works when the ignition is in ON/
RUN. The defogger turns off if the
ignition is turned to ACC/
ACCESSORY or LOCK/OFF.
8-3