2012 Chrysler Town And Country wipers, windshield & visibility problems

I reserved a 2012 town and country in august of 2012,,, ( they said that way the only auto that they had on the lot) from enterprise that had a defect in the rear window,,, I pick up the car on 9/24/2012 and stop for the night in ga,,, that night it went down to 30 degrees.. I turn on the rear defroster and the window blow up as we were heading north on I-75.

The object sensor modules are located in a "wet zone" yet the part is not water proof. The moisture blew out the circuit board of the module and actually deformed the housing. When I removed the passenger side sensor I found it was packed with mud and other debris. The sensors went simaltaneously and the triangle warning light stay "lit up" as you drive. I looked into having the issue fixed and found that the module is over $800 - that is over $1600 to fix a "safety nuisance" a poor design caused the issue.