Any tips on replacing the radiator fan?  I get the idea that these don't
fail too often, since the part is hard to find.

In case anyone is interested, here's the options I found for buying the
part:

Dealer: $320 (gulp!)
Local (Raleigh, NC) salvage yard: $150
Bus Depot: Sorry, dealer only part
Bus Boys: Listed on their web site for $199, I didn't call.
AVP: No stock, have only ever sold 2.  Can get one for $204.
BW salvage yard in Sacramento CA area: $100

I ended up having BW send one to me.  When I called AVP, they located the
used one at BW for me, then had me deal directly with BW.  Wow, that's
service!

Bill