Just got back from the Rugby club after celebrating doing my Radiator ! Like they all say hit the nut harder ! I used a thin spanner I had from a Flymo, put an open ended spanner on to it and hit it hard ! Hey presto, nut loosened, fan off radiator out and replaced. Total time about 1 1/2 hours work. The cowl needs to fit on properly at the bottom to ensure its drawing air through (extra 1/4 hour wasted there ) and one of the bottom fixing nuts was a b@$)@rd to get in but ..so far...its tickety boo ! I am so chuffed coz I am normally useless with tools. (I'm paid for what I know, not what I do.... ) Good Luck !