I need help. I have 1998 90hp mercury outboard that is sounding the overheat alarm at full throttle than after I back off the throttle a few seconds later it goes off and than back on when under load again never goes off at idle can drive the boat 20 minutes at 5 miles and hour and no alarm only under load. I have changed the water pump, thermostat and pop it valve and still alarm goes off I know it’s the overheat alarm because on my engine there is no warning module so the alarm sound is the same for low oil and overheat so I disconnected the low oil sensor and get the alarm still disconnected the temperature sensor and the alarm does not sound. When it goes off power head does feel a little hotter than I would like so assuming it’s a real overheat issue. One thing to note when I changed the water pump a 10 millimeter bolt in the housing won’t tighten all the way threads are gone I guess and didnt have the gasket for under the water pump plate so I made my own out of permatex also notice a good amount of water coming out from behind the zincs above the lower unit at the mid section and water also coming out as a steady stream from what appears to be a weep hole on the top of the lower unit. Could I have leak at the water pump housing or a crack in the black vent tube that connects the water pump housing to the pick up tube and therefore not getting enough volume of water to the power head under load? Will pull down the lower unit to inspect and redo with new gasket and helicoil the bolt if I have to just seeing if anyone has seen this before and if I am missing something else thanks so much. Oh forgot to mention strong pee steam coming from tel tail in all instances