> wrote:
>Have a 68 Buick with a 430 V-8. The "Hot" light comes on when the car
>has been driven and then sits with then engine off for approximately 20
>min. If the car is started and the light comes on, I can rev the
>engine up a bit and the light will go out. If I drive it below 75mph
>the temp light stays out...if I drive it fast...then slow down and
>drive 65mph...the light eventually comes on.
>The engine was rebuilt about 2 yrs ago, the engine has a new radiator,
>water pump, themostat and temp sensor. I took a chance and replaced
>the water pump....no such luck. The sensor was checked to make sure it
>works...works fine. I am thinking about replacing the radiator and
>finding a differant fan. Any thoughts? Please contact me at
.

If you measure the surface temperature of the radiator, what do you get?

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.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."