Buick 1999 Riviera Owner's Manual page 146

Manual Operation
You may also manually adjust the air delivery or fan speed.
AIR FLOW: This button is used to change the direction
of the airflow. The airflow choices available are FLOOR,
-
FLOOR MID, MID and WINDSHIELD
If the system is set for AUTO, pressing the AIR FLOW
button will display the current airflow direction and the
comfort setting. Press the AIR FLOW up or down
button again to change the direction of the airflow.
If the AIR FLOW up button is selected while in the
FRONT defrost mode, the system will direct the air
toward the WINDSHIELD. If the AIR FLOW down
button is selected while in the FRONT defrost mode, the
system will direct the air toward the FLOOR, and the
FRONT defrost mode will cancel. Notice the arrows in
the display.
OFF: If the passenger's comfort control is turned on, it
can be turned off by pressing the OFF button once.
Pressing the OFF button a second time will turn off the
main system. Turning off the main system causes the fan
to turn off and the airflow to be directed to the FLOOR.
The system will still try to keep the interior of the
vehicle at the previously chosen comfort setting. The
outside temperature will show on the display when the
system is set to OFF.
3-4
The ventilation system always allows fresh air to flow
through the interior when the vehicle is moving even
with the system in the OFF mode.
VENT: The VENT button allows outside air to flow
through your vehicle without the air conditioning
-
FLOOR.
compressor working. Selecting VENT and the AUTO
button at the same time allows the system to control
automatically without the use of the air conditioning
compressor or the use of the RECIRC mode. To turn off
the VENT selection, push the VENT button again.
RECIRC: When RECIRC is selected, the system will
limit the amount of outside air entering your vehicle.
This is helpful when you are trying to cool the interior
of the vehicle quickly or limit the amount of outside air
entering your vehicle for some other reason. RECIRC
and AUTO may be selected at the same time. The
system will remain in RECIRC until the ignition is
turned off, then the system will return to the previously
selected mode. RECIRC can be selected in all manual
airflow modes except FRONT defrost. RECIRC cannot
be selected with the VENT button.
Operating RECIRC in cold temperature or under high
humidity conditions may cause moisture to form on the
inside of the windshield. If this condition occurs,
deselect the RECIRC button.
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