Interior Window Frost
 

Hi

I recently purchased a used 2007 Mazda3 and I've been having an issue with interior window frost.

Frost accumulates on the interior window after I leave the car out in -20C for about 8 hrs. Has anyone noticed anything similar? or have tips/advice?

I'm not sure if this is related, but I also noticed the middle "recirculate air" button (bottom center of pic) doesn't work.

http://www.productwiki.com/upload/im...g_controls.jpg

my guess - warm car, cooling quick causing condensation which then freezes.