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viscous fan clutch. If the clutch is engaged, you aint gonna stop that fan. It'll break before it slips the clutch or the belt. On my old chevy I had one of them flex fans (steel fan was so sharp it cut you just by putting it in) and it didn't have a clutch. That fan saved my radiator when a stick tried to poke through it from the back side. Fan was bent up a little and for some reason I had woodchips all over my engine