Lexus LX 470 1998 Owner's Manual page 156

If manual switching of air intake is desired −
20X023a
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.
20X062
When you turn the "TEMP" knob, the sensitivity changes from "+3"
down to "−3". If you do not operate any button for a few seconds or
if you push the button other than the air intake control button and
temperature control knob, the previous display returns.
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