Oldsmobile 1999 Aurora - Manual (Page 147)

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DEFOG: This setting directs the majority of the
airflow to the lower floor outlets and the front defroster.
A small amount of airflow is directed to the side
window defroster outlets. This mode can be useful to
remove the moisture from the inside of the windshield
when the outside temperature is cold or the humidity
is high.
DEF (Defrost): This setting directs the majority
of the airflow to the windshield with some airflow to
the side window defrosters and lower floor outlets.
To increase the fan speed, turn the AUTO FAN
knob clockwise.
RECIRC ON: Press this button to 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. The RECIRC ON button and the
AUTO
- PUSH knob may be selected at the same time.
The system will remain in RECIRC ON until the
ignition is turned off, then the system will return back to
the previously selected mode. RECIRC ON may be
selected in all manual airflow modes except
front defrost.
Operating the RECIRC ON mode in cold temperatures
or under high humidity conditions may cause moisture
to form on the inside of the windshield. If this condition
occurs, deselect the RECIRC ON button.
A/C ON: Press this button to turn the air conditioning
on and off. If the system is operating in the automatic
mode, the A/C ON indicator light will automatically
illuminate. In the auto mode, the A/C compressor will
only operate when the system determines it is needed.
OFF: Turn the AUTO - PUSH knob to OFF. Turning the
system off will cause the fan to turn off and the airflow
to be directed out the lower floor outlets. The system
will still try to keep the interior of the vehicle at the
previously chosen comfort setting. The outside
temperature will show in the display when the system is
set to OFF.