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I had the same problem on mine. I've been told that the extra stress of the fan constantly running is harmfull for your water pump bearings. I got a replacement fan clutch from autozone or napa for $36 bucks. The radiator removes easily, you need a 12mm crescent wrench to get the old clutch off... or is it 10mm?

10 mm and the radiator and shroud can stay. Just remove the upper radiator hose <img src="/forums/images/graemlins/scared.gif" alt="" />
Danny

1985 SR5 4Runner
eLocked with Carter Lock
4.7:1 single case
Davez Offroad twin stick