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Old 08-06-2013, 11:53 AM
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Rzeppa Rzeppa is offline
Cruise Moab Chairman & RS Secretary
Join Date: Aug 2005
Location: Kittredge CO, USA
Posts: 5,977

Fan clutches are pretty simple - they have a bimetallic coil inside that operates a valve for the silicone fluid inside. Above a certain temperature they lock up, below that and they spin somewhat freely. Like an electric fan, they are supposed to only run when needed. The failure mode for old clutches is the fluid gets thin and won't lock up or it leaks out. Other than a new clutch, you can simply replace the fluid, it is available from Toyota.
Jeff Zepp
Kittredge CO USA
1971 & 1976 FJ40s, 1978 FJ45, 1987 FJ60
Rising Sun 4WD Club, TLCA #4063
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