Lexus GS300 1998 Owner's Manual page 214

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Each time you push the air intake control button, the mode
changes in order from the RECIRCULATED AIR mode to
AUTOMATIC mode to OUTSIDE AIR mode, then back to
the RECIRCULATED AIR mode. Each indicator light shows
which mode is now selected.
1 RECIRCULATED mode – If quick circulation of
cooled air is desired, select this mode.
2 AUTOMATIC mode – When driving where the
outside air is dirty (i.e., when the vehicle running just in
front of your vehicle accelerates rapidly), the system
changes automatically from the OUTSIDE AIR mode
to the RECIRCULATED mode.
3 OUTSIDE AIR mode – The system will take fresh
outside air into the vehicle.
AIR CONDITIONING AND AUDIO
For normal use, it is best to keep the air intake control button
set to OUTSIDE AIR mode. If recirculated air is used during
heating, the windows will fog up more easily.
To change the sensitivity of the sensor switching between
the RECIRCULATED and OUTSIDE AIR in the
AUTOMATIC mode, push the air intake control button
until the "AUTO" indicator light flashes. The display
changes as illustrated below.
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