Reversed battery

I was in a hurry one morning and reverse the battery on my 2007 KIA Rondo installing it. The fuse to the alternator was fried so I replaced that and is good, but the air conditioner still doesn't work. The indicator lights on the panel don't light and no air. The air conditioner fuse on the driver's side door jam was blow, but when I replaced it it blew the second I turned the car on. It appears to be a ground short. I called a few repair places but know one would even give me a ballpark estimate. I am very nervous taking it the the dealer with a "blank check" I can't afford to spend $2,00 to have it repaired. Is it possible for me to fix? Everything else in the car works normally.