I have a 1997 Chrysler Concorde and I have what I believe is radiator fluid misting on the inside of my windshield. it takes about 3 days before I notice it, and windex cleans it up. I am going to take it in to see what is exactly wrong with it. My question is, has any one replaced the heater core in this car? I got a qoute of 658 bux to replace it.. its a 70 dollar part.. Can I replace it myself with the help of friends?