Defogger problems of the 2008 Dodge Grand Caravan

During the winter last January 2009, I drove from kenosha WI to minneapolis mn. It was the new year weekend and on the trip back, the front windshield became caked with frost on the bottom. Mostly outside. The defrosters did not clear the bottom 6 - 8 inches of the windshield. This causes two problems, one the frost starts to build on the inside and begins to drip and there is water on your dash, second because the outside is caked your wipers begin to freeze up. Even if you clean it recurs quickly. The wipers being caked causes them not to work well clearing they just produce water streaks across your windshield, your vision becomes more and more obstructed because they can;t work. I called my Chrysler dealer and he said they would address the next time I come in. I cam in this fall because I wanted to be able to show them it happening. They now state that all the Dodge vans are like that and they cannot address it. I believe this is a safety hazard and should be addressed.