Today I drove 50 miles and picked up a D.C. WD2600 demo machine to try for a few days. Brought it home and put it to work on a customer's 1 acre lawn. It ran 5 minutes and overheated. I found that radiater fan is not running. Dealer has no idea what to do to make a field repair and says I'll have to haul it back in. That will cost me another two hours of wasted time. Any of you Chopper owners got any ideas how I might find and fix this problem myself.