The windshield will fog up. In the mornings there will be frost inside the windshield.

Hi, I have the same issue with my 2006 S40 Volvo. I tried leaving two windows cracked but it only seemed to make the problem worse. My next step is to spray Rain-X on the inside of the car overnight. I am nervous to drive my car especially in the afternoon/night when light is low and the car fogs up...