> >On Fri, 23 Apr 1999, Davidson wrote:
> >
> >> Well,
> >> if temperature plays any significant role in the viscous coupling locking
> >> up, it seems that we should see VCs in hot climates having a greater rate of
> >> failure. Does anyone have any evidence to support this?
> >> Bill

The heat comes from prolonged driving at highway speeds with the VC "engagred" due
to differing tires sizes.  It is this internally generated heat, not the outside
temp, that cooks the fluid and may warp the plates, IMIO