Automatic Operation
The system automatically controls the fan speed, air delivery, air conditioning, and recirculation to heat or cool the vehicle to the selected temperature.
When the AUTO indicator light is on, the system is in full automatic operation.
To place the system in automatic mode:
1. Press AUTO.
2. Set the temperature. Allow the system time to stabilize. Then adjust the temperature as needed.
To improve fuel efficiency and to cool the vehicle faster, recirculation may
be automatically selected in warm weather. The recirculation light will not come
on. Press the 
to select recirculation;
press it again to select outside air.
See also:
Overview
GMC unveiled the all-new 2007 Yukon and Yukon Denali full-size SUVs Oct. 5.
They are based on GM's all-new full-size SUV family, which features distinctive
styling, spacious and refined interiors, ...
Passenger Sensing System
The vehicle has a passenger sensing system for the right front passenger position.
The passenger airbag status indicator will be visible on the overhead console when
the vehicle is started.
Uni ...
Infotainment Control Buttons
The buttons on the faceplate are used to start primary functions while using
the infotainment system.
VOL/ (Volume/Power):
1. Press to turn the system on and off.
2. Turn to adjust the volume.
...