GMC 2002 Yukon Denali Owner's Manual page 179

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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 "Mode Knob
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.
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(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 "Recirculation" following
for more information.
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Automatic Operation"
(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
"Recirculation" 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
"Recirculation" 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.
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