I saw a post on a fix a long time ago; I remember it saying you could fix the fan clutch by drilling a small hole on the back and refilling it with some special heavy oil used for Toyota fan clutches using a Turkey baster syringe, then plugging the hole back up with solder, liquid solder or epoxy. I understood what goes wrong with the fan clutch is that oil leaks out or looses viscosity. Never tried it so I don't know if it works but it is a cheap fix that I understand works for Toyotas.