'98 Patrol GUII, ST,4500 - viscous hub radiator fan complete
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You can replace the viscous gel in the hub, the down side is the fluid you need is sold by Toyota tho , but for fan hubs that do not come apart, you can drill a small hole and plug with metal mend ,epoxy or such products, i should make it clear i have NOT done this mod to a Patrol fan myself, so i would suggest more googling before undertaking the job.