I drive an Autotrail Tracker on a ducato. Driving up through France last week, I got stuck behind a tractor pulling tons of hay. A lot was flying everywhere. It was a very hot day so I had the fan on to cool me and the wife. Before I could back off some straw my have entered to pipe work and the fan started to go click click click. It. Now doesn't work so I assume there is some straw stuck in the rotating bit of the fan. Anybody got suggestions as to the way forward, and how do you get at the fan to confirm my suspicions