the viscous fan does not come on till the engine temp reaches 80 deg. once it comes on it runs continually,the temp remains constant at 80 deg and the engine doesnt overheat. I have checked that the rad is clear but with the fan continually running it raises the noise level in the cab Ihave had this problem for the last six months

Bob Lamb, April 2007

I solved the problem myself by changing the viscous fan coupling .When I removed the old unit it had a tight spot when rotated, and the fitting of a new unit £135 Trade Price solved the problem. hope this information helps others in the future
Regards Bob Lamb

Bob Lamb, May 2007