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Tuning and Understanding your Toyota Viscous Fan Clutch

yeah seen that before - tried it myself, added more fluid to one and it made no discernible difference (still couldn't hear the fan running when the truck started to overheat). Apparently the couplings are assembled in a vacuum (you can feel it and hear it when you pull it apart) and don't seem to work so well if you don't do the same when you put them back together again. Just bought a new one in the end!

Regards
Mark
 
Worked lovely when I did mine. And can still hear the fan even now when she starts to get hot.
 
Been topping up viscous units for years.
You know they're working if it sounds like an aeroplane when you blip it when hot.
But lots of fiddly guess work at times, Mitzi units are nothing like Toyota units for eg

Apart from the bi-metallic adjuster seizing there isn't actually anything in them to go wrong.
 
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