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How viscous would a viscous clutch get if a viscous clutch could get viscous????

So I had my Radiator rodded out today and a few small leaks fixed in my radiator and I decided to see how stiff the viscous fan clutch got over the range of temps.

Well it spins but offers very little resistance when cool and when the truck has been running for a while and is actually pretty hot but not overheating it is pretty firm but I can stop it with a wadded up rag if I make some effort. With the motor of it is stiff but I can turn it with my hand.

Should I be getting more resisitance than this? How Much?


Thanks

Eric

95 Disco 174k miles
 

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Don't have much to offer you on this subject. Our 96 Disco's viscous fan turned to concrete about 2 years ago - when you turned it cold or hot, it was real stiff and you could feel irregularities in the resistenace - it was finished - even at 2000 rpm the truck sounded like a B17. Went the 'Flex-a-lite' electric fan route. To try to answer your question: what about going down to the dealer to check out a few of the used vehicles on their lot?
 
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