My 2005 Sportage is very difficult to keep from getting fogged up. When the temp is below freezing I can never see out the second row windows or the rear window. I notice no difference in the air quality when I push the button to recirculate cabin air or leave it in the default position for fresh air. The dealership could find no problem with the mechanism but I have a feeling the recirculate air button is on whether the light is illuminated or not. Any ideas?