Think I have figured it all out. Was wanting to know what electrical connections were what and where the pipes all went but have it figured. I think.
 
I have a P38 Diesel (BMW Engine), I need to remove the fan assembly; I have a tool that fits, I need to know, if facing the windscreen, do I try to undo clockwise? Also: what is the best method to stop the attached pulley wheel from turning? Simon
 

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