Ugh. I just got a 2006 limited which i purchased from my father two weeks ago. Since then the interior has been fogging up very badly. The rear window defrost works great and the front window one as well. The front side windows can be defrosted at least 90% - manageable. The rear windows are almost constantly fogged up. It's winter here and cold but I've never had this happen in my other 2006 GLS sonata. I've tried the automatic temp setting and also manual as well as having the AC on and nothing seems to work. This is a big problem. The outside temp reading is always about 20 degrees higher than actual but even when it reads below freezing I have fogging up problems. My dad said it was never like this for him and he's as honest as they get. Any suggestions??