Lexus ES300 2003 Manual page 181

This button allows the air intake to select OUTSIDE AIR mode
automatically. This is to clean up the front view more quickly.
If you want to return the setting to RECIRCULATED AIR mode,
push the air intake control button once again.
Push the "A/C" button for dehumidified heating or cooling. This
setting clears the front view more quickly.
CAUTION
Do not use the windshield air flow button during cooled
air operation in extremely humid weather.
difference between the temperature of the outside air
and that of the windshield could cause the outer surface
of the windshield to fog up blocking your vision.
(c) Operating tips
D To help cool down the interior after parking in the hot sun,
drive for the first few minutes with the windows open. After
the excess heat has blown away, close the windows.
D Make sure the air inlet grilles in front of the windshield are
not blocked by leaves or other obstructions.
D If air flow control is not satisfactory, check the side vents and
rear vents. (See "(d) Side vents and rear vents".)
D On humid days, do not blow cold air on the windshield. The
The
windshield could fog up because of the difference in air
temperature on the inside and outside of the windshield.
D Keep the area under the front seats clear to allow air to
circulate throughout the vehicle.
D On cold days, set the fan speed to high for a minute to help
clear the intake ducts of snow or moisture. This can reduce
the amount of fogging on the windows.
D When driving on dusty roads, close all windows. If dust
thrown up by the vehicle is still drawn into the vehicle after
closing the windows, it is recommended that the air intake
be set to the OUTSIDE AIR mode and the fan speed to any
setting except "OFF".
AIR CONDITIONING
167