The first thing to do is go HERE...............
http://patent.womplex.ibm.com/details?&pn=USO5400823
David Massey wrote:
>
> Message text written by Peter Zaborski
> >With the deep knowledge on this list I am sure someone knows the answer to
> this question about cooling fans.
>
> When the cooling fan is mounted to the engine via either direct attachment
> to the crank or through a fan belt, and activated through a viscous
> coupling, what it the mechanism by which the viscous coupling is activated?
> Is it based on some temperature switch in the coolant, or a temperature
> switch in the viscous coupling fluid, or a pressure switch in the viscous
> coupling fluid, or through some other means?
>
> Thanks in advance for any insights.
>
> Peter Zaborski CF58310UO
> <
>
> Thank god, a technical question!
>
> The viscous clutch itself is sensitive to the temperature of the air
> passing by and responds accordingly.
>
> Dave
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