I had my mechanic come down and do a dockside test with with his Thermometer to check out my low idle overheat issue on both engines. Of couse when he was ther it did not happen. His theory is that since we had a very cold winter, the wax in the T Stats might have hardened and it might have taken one or two times of starting and running the engines to loosen up the T Stats. Does this make sense to owners who keep their boats in cold climates? We started up the engines and after about 8 minutes, the top cylinders reached 150 deg and then quickly dropped down to 106 deg after the T Stat opened. Both engines ran at this temperature for about 40 minutes without an issue. The mechanic also took apart the PRV's and they were both clean. I still do not know if I have a problem that is intermittant or if it is solved??