Outlet Adjustment - GMC Yukon Owner's Manual

The interior temperature sensors located in the
headliner above the driver side seat and if equipped, in
the headliner above the second row seats measure the
temperature of the air inside the vehicle.
There is also an exterior temperature sensor located
behind the front grille. This sensor reads the outside air
temperature and helps maintain the temperature inside
the vehicle. Any cover on the front of the vehicle could
cause a false reading in the displayed temperature.
The climate control system uses the information from
these sensors to maintain your comfort setting by
adjusting the outlet temperature, fan speed, and
the air delivery mode. The system may also supply
cooler air to the side of the vehicle facing the sun.
The recirculation mode will also be used as needed
to maintain cool outlet temperatures.
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Outlet Adjustment

Use the air outlets located in the center and on the side
of the instrument panel to direct the airflow.
Operation Tips
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 the
windows.
When you enter a vehicle in cold weather, press
the fan up button to the maximum fan level before
driving. This helps clear the intake ducts of snow
and moisture, and reduces the chance of fogging
the inside of the window.
Keep the air path under the front seats clear of
objects. This helps air to circulate throughout the
vehicle.
Adding outside equipment to the front of the
vehicle, such as hood-air deflectors, may affect the
performance of the heating and air conditioning
system. Check with your dealer before adding
equipment to the outside of the vehicle.