Buick 2004 Regal Owner's Manual page 116

VENT (Ventilation): This mode brings in outside air
and directs it through the instrument panel outlets.
BI-LEV (Bi-Level): This mode directs approximately
half of the air to the instrument panel outlets, and then
directs most of the remaining air to the floor outlets.
Some air may be directed toward the windshield.
HTR (Heater): This mode directs most of the air to the
floor outlets, with some air directed to the outboard
outlets, for the side windows, and some air directed to
the windshield.
BLEND: This mode directs half of the air to go to the
floor outlets and half to the defroster and side window
outlets. The air-conditioning compressor will run
automatically in this setting unless the outside
temperature is below 40°F (4°C).
The right knob can also be used for the defrost mode.
Information on defrosting and defogging can be
found later in this section.
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FAN: The left knob controls the fan speed.
OFF: Turn the knob all the way counterclockwise to
turn off the fan.
LO (Low Fan Speed): This setting creates the lowest
fan speed.
3-18
HI (High Fan Speed): This setting creates the highest
fan speed.
DRIVER (Driver's Side Temperature): The lever on
the left adjusts the air temperature for the driver's
side outlets. Slide the lever up to raise the temperature
and down to lower the temperature.
PASSENGER (Passenger's Side Temperature): The
lever on the right adjusts the air temperature for the
passenger's side outlets. Slide the lever up to raise the
temperature and down to lower the temperature.
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(Air Conditioning): Press this button to turn the
air-conditioning on and off. An indicator light above the
button will come on when the air conditioning is on.
During daylight hours the interior lighting control might
need adjustment to the highest setting in order for the
indicator light to be seen. The system will cool and
dehumidify the air inside the vehicle when the A/C
indicator light is on.
On very hot days, open the windows long enough to let
hot, inside air escape. This reduces the time for the
vehicle to cool down.
For a quick cool-down on a very hot day, use MAX with
the temperature levers all the way in the blue area. If this
setting is used for long periods of time, the air in the
vehicle may become too dry.
For normal cooling on hot days, use VENT with the
temperature levers in the blue area. The system will bring
in outside air and cool it.