What is up with the air recirculation in my Mazda 3?

lalala

New member
I have a 2009 Mazda 3. I have asthma, so I keep the air recirculation on, except of course when using the defroster because obviously the car doesn't allow that.

Sometimes, I'll notice that I smell the truck exhaust and look down to discover that air recirculation is off again.

What's the deal with that?

To repeat, I know you can't use recirculated air for the defroster on this car. This is happening when the defroster is not on and has not been on.
 
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