get on ebay ...23 quid for a brand new fan
you will have to make a subframe to tap it in to but its not difficult to do

other than that you will have to take the pain ...its a 20 min job to take tha rad off ir ecently fixed one for a m8 he had dropped the bike and the fins were sticking on the frame ..we managed to dremmel the ends off the fan and it ran again ..worth alook
take it off and run it dirct from the battery make sure is knackered or just sticking
check the fuse under the seat via the handbook ..if its blown you may be able to get it running again

http://www.ebay.co.uk/itm/Motorcycle...item2ec3680739