Lexus RX300 Manual page 152

If manual switching of air intake is desired –
20R007a
The air intake control button is used to switch the air intake between
the OUTSIDE AIR mode and RECIRCULATED AIR mode. The
indicator on the switch shows which mode is selected.
D With the indicator on – For RECIRCULATED AIR mode
D With the indicator off – For OUTSIDE AIR mode
For normal use, it is best to keep the setting to OUTSIDE AIR mode.
If recirculated air is used during heating, the windows will fog up
more easily.
If the engine coolant temperature becomes extremely high, the
RECIRCULATED AIR mode is automatically selected. This is not
a malfunction. When the engine coolant temperature is lowered, the
previous mode resumes.
AIR CONDITIONING AND AUDIO
If manual on–off of the air conditioning is desired –
Push the "A/C" button to turn the air conditioning on and push it
again to turn the air conditioning off.
The air conditioning does not work if the outside temperature is
lowered down to around 0_C (32_F).
If the system is used for ventilation, heating in dry weather or
removing frost or exterior fog on the windshield, turn the air
conditioning off once it is no longer required. This will improve fuel
economy. The air conditioning can be used for year–round
automatic temperature control including cooling and dehumidifying
operation.
If the air conditioning compressor does not operate, the indicator of
the "A/C" button will blink. If the indicator of the "A/C" button
blinks even when the "A/C" button is pushed again, have the
compressor checked by your nearest Lexus dealer.
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