2008 Gr Caravan SXT - Defroster Problem

My wife has a 2008 Gr. Caravan SXT. The lower 3 inches of the windshield ice up and don''t clear even with the defroster on high. The wiper blades scrape and seem as if they will tear themselves
apart. The vents from which the air flows point away from the window and too much of the air flow goes into the driver''s face. The dealer has examined this and says it is the way they are supposed to be.
There is no electric grid in the bottom of the window to clear that 3" or so of ice.
Have any of you had a similar problem?
Thanks in advance.

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