There is a large discussion on here from several years ago about this problem with all 8th gen cars (06- limited cars). The problem is in the passenger side kick panel where the main power for the rear defroster goes through a wiring harness plug. It's a heavy gauge wire that carries a lot of current, which the small terminal cannot handle. Over the years it eventually burns up. Cut the wire out of the terminal and splice it together. It needs to be spliced together with the same gauge wire, then soldered together and heat shrink wrapped or taped up. No fuse is needed, because it already has one in the cars fuse panel. If your car has never had this fix, this is where your trouble is.

 

Thanks so much i appreciate the help and quick answer. Just wanted to make sure if there was anything to check first.

 

Excellent information with photos: https://www.impalaforums.com/diy-ho.../diy-how-to-s-and-write-up-s/251292-rear-defroster-burnt-wire-fix-write-up.html

 

I had that same problem on my daughters 08. burnt wire on the passenger behind side kick panel connection.