Viscous fan problem

[Datsunman]

When I'm driving a great deal of the time I can hear the viscous fan whirring away and every now and then I hear the sound die away but after a minute or so it'll be back...usually after slowing to a junction or stopping. It seems to me that the engine is driving the fan a great deal more than it should as the engine (TD27T) temperature is stable and it makes no difference what the ambient temperature outside is. If I turn the fan when the engine is stationary and cold, it turns on the coupling but there's quite a bit of resistance so I'm thinking there's something up with it. Most others I have ever had spin freely. It looks to me like the viscous coupling cannot be removed from the water pump... it this the case?

 

Would a thermo electric fan be better anyway? I'm thinking of maybe pulling the fan off of the viscous coupling and sliding a thermo fan in there instead. Is this any better than the engine driven fan or should I just try to locate a functional viscous coupling?

 

Cheers,

Ed

[Extreme90path]

I like Termo Electric fans. No pull off of engine power that way.

[88pathoffroad]

An electric fan will work well, but the belt-driven fan will cool better, particularly at lower speeds. You choose.