Okay guys I called Freightliner Customer Assistance and the fan is a Kysor and I can get it through Freightliner and is coming from Reno and price is $251.24. I will order today and take the bed apart and if I can reach it from the top I will change it. It does not come with a hub or stand off piece its just a flat fan with about six bolts, maybe I can change it without screwing it up. If I can't get to it I will take it to Peterson Cat or Golden Gate Truck Center. Through all my years I have discovered that I know just about enough mechanical stuff to get me in trouble, but I'm still trying. Thanks everyone for your help.