Chevrolet 2008 Uplander Owner's Manual page 185

Operation
Turn the right knob clockwise or counterclockwise to
direct the airflow inside of your vehicle.
To change the current mode, select one of the following:
H
(Vent): This mode directs air to the instrument
panel outlets.
)
(Bi-Level): This mode directs half of the air to the
instrument panel outlets, then directs the remaining
air to the floor outlets. Cooler air is directed to the
upper outlets and warmer air to the floor outlets.
6
(Floor): This mode directs most of the air to the
floor outlets. Use this mode to send air to the rear of
the vehicle. Keep the area under the front seats free
of objects that could obstruct airflow to the rear of
the vehicle.
The right knob can also be used to select defog or
defrost mode. For more information, see "Defogging
and Defrosting" later in this section.
Outside Air: This mode will be automatically selected
when your vehicle is in any mode except maximum
air conditioning.
A
(Fan): Turn the left knob clockwise or
counterclockwise to increase or decrease the fan speed.
Turn the knob to 0 to turn off the fan. The fan must
be turned on for the air conditioning compressor
to operate.
Temperature Control: Turn the center knob clockwise
or counterclockwise to increase or decrease the air
temperature inside your vehicle.
#
(Air Conditioning): Press this button to turn the
air-conditioning system on or off. When it is pressed,
an indicator light in the button will come on to let
you know that air conditioning is activated.
You may notice a slight change in engine performance
when the air conditioning compressor shuts off and
turns on again. This is normal. The system is designed
to make adjustments to help with fuel economy while
still maintaining the selected temperature.
On hot days, open the windows to let hot inside air
escape; then close them. This helps to reduce the time
it takes for your vehicle to cool down. It also helps
the system to operate more efficiently.
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