I too have window fogging problems. All cars may experience this issue but with the CF, it was and is overwhelming. The first time the window fogged up, I had to pull over because visibility became zero. The solution is to immediately direct the airflow to the defroster and adjust the air is cold as possible. The fogged window happens in non winter weather (for me) because the CF is garaged during winter months. Sometimes, when the car is first started (after running for a while) heat is released to the front window, the front window fogs heavily. I use the a/c immediately full blast to the window defroster with no airflow anywhere else. The problem is very unsettling. I have no water leaks that I am aware. Beware to all owners of CF!