Buick 2007 Terraza Owner's Manual page 194

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.
194
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.