[C320-list] High Engine Temp Alarm

[Kurt R. Budelmann, M.D.]

I was running the engine full throttle to come into a protected harbor in advance of a severe thunderstorm when the alarm went off.  The water was 86 degrees and the air temp was 93 degrees.  The engine temp was 200 degrees.  I stopped engine to release suction at water intake and then restarted engine and let it idle and eventually the temperature came down.  Water was coming out of the exhaust port.  At the dock while the storm was raging I made sure the strainer was clear, water was pouring through the filter when I opened the seacock briefly, the impeller checked out and there was enough coolant.  Do I have a thermostat problem or was I running the engine too hard?  Any other ideas?
__
Kurt R. Budelmann
Everwind, Catalina 320 #1035