I had a problem with overheating when going over passes to Montana. It was fine on level land where I live so let it go until I had no heat in the winter. Our mechanic found the propellers on the water pump were totally gone. He said Lincoln or Ford makes the water pump with disinigrating materials. We had to get our system including the radiator flushed before we figured out the problem and now we still have debris in the water. I see the problem has continued through 2010. You would thing they would have fixed it by now. Seems as if this should be a class action lawsuit.