So you need a new viscous coupling...........you will need a 32mm spanner, I went to a caravan centre and purchased a gas bottle spanner and ground it out approx 2mm to fit, on the front of the fan you will see a large nut this is the 32mm one but just check it is.
The thread is left handed,so the opposite way to normal put the spanner on and give it a sharp thump with a hammer this may take a few attempts as you will find out the coupling will rotate, hense why you have to give it a sort of suprise thump with the hammer, if you are unable to get it off as its to tight which it shouldnt be there is a special tool from BMW around £20 which holds the pulley.
Once off the rest is really just common sense, I think there are 3 or 4 bolts which hold the fan on to the coupling.
And yes this will stop or should stop the overheating as for the idle it may well do as it wont be running hot, if not we can go further.
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Last edited by marti5; 07-08-2009 at 03:16 AM.