Subaru 2003 Legacy Owner's Manual page 168

n Air inlet selection button
WARNING
Continued operation in the ON position may fog up the windows.
Switch to the OFF position as soon as the outside dusty condi-
tion clears.
ON position (Recirculation): Interior air is recirculated inside the ve-
hicle. Push the air inlet selection button to the ON position. The indi-
cator light will come on.
OFF position (Outside Air): Outside air is drawn into the passenger
compartment. Push the air inlet selection button again to the OFF
position. The indicator light will go off.
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HB5008BB