I have the guage in the bottom of the water manifold where they feed to the
fuel coolers and eventually out the pee hole.
Thelflex suggests that as one of the points. This is all with the boat in the
water running. It will not fail on a trailer. The boat needs to be pushing
water to be running hard enough to overheat.
With the thermostat out it acts similar at speed, overhreating around 4000, but
up to about 2000 RPM this thing won't even get hot enough to make the computer
happy (100-110 degrees, without the thermostat). It runs like a car in "limp
home mode".
I only tried that once, just to see if there reallty was TWO bad thermostats.
(I am on #3 now in the $300 hunt).
I really think this is just not pumping enough water and under a load it
overloads the ability to cool. Simple huh?
You can see why I really want to swap the whole damned foot.