Just fixed a problem with the same symptoms. Drove me nuts when replacing
impellers didn't help. Then I found a kinked hose while getting ready to do
a backflush. Prolly is a fried impeller but if that don't fix it look at
hoses.

"Chris" wrote in message
om...
OK, I am a new boat owner and am learning the hard way. I am pretty
sure that I have fried the water impeller in the stern drive. ....
..... When I rev the engine to about 2000 rpm, it cools back down. ....