It s preferable to draw in fresh air rather than recirculate existing cabin air.
Floor cabinair recirculate car intake.
But for your wife s issue you just need to make sure you get a car with a cabin air filter and make sure you have a hepa grade filter in place.
However filters located under the hood at the air intake will not filter recirculated air.
Using the recirculation button helps get your car as cool as possible when it s hot outside and you have the a c on.
Car s intake vent easy to find.
The outside air intakes for the heating and cooling system are at the base of the windshield.
It recirculates the kind of cool air that you get from the a c when you first turn it on and the longer it s on the cooler you car gets until it s as cool as the system can possibly be.
Automakers tout their ability to filter out dust particles smells and more.
Caddyman 2010 03 11 05 51 19 utc 5 some outside air must be brought into the interior of a car or the trapped inside air gets polluted quickly enough high moisture levels and co2 levels and.
Keeping the system in recirculation mode particularly with the a c off can cause the windows to fog up.
Just be sure to replace it as frequently as your manual suggests.
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The systemshould be left in fresh air mode under almost all conditions.
Cabin air filters will usually filter the air on either setting if located on the cabin side of the firewall.
Originally published january 13 2006 at 12 00 am.