Scott Dorsey wrote:

>
> Is the fan actually turning properly? If high engine RPMs makes the
> light go out, it sure seems like you don't have proper airflow.

I may be wrong but I think he is saying that high speed driving is what
causes the light to come on. He said "If I drive it below 75 mph the
temp light stays out...". Of course he said other things that seem to
contradict this also so we have to guess what he is really meaning.

But, if high speed is truly the only thing that leads to the light
coming on, I would guess the gauge is accurate (at least relatively
speaking). It clearly is getting hotter when driving 75 mph than it
normally does which it shouldn't. The sending unit might be a little bit
extra sensitive but there isn't anything about high speed driving that
would cause the gauge to behave differently other than temperature.
There are a couple things that immediately come to mind that might
cause this. Lower radiator hose collapsing (partially blocking flow) and
bad distributor advance. If the mechanical or vacuum advance in the
distributor are not working the engine produces a lot of extra heat at
high speeds.

-jim

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