1994 Mercury 200 2.5 offshore overheat alarm at higher speed.

[steplift20]

So that's what a poppit valve does, mine to the temp hoes way up at slow speed I have to get going to bring gone temp down Thermostats are changed every year impeller is not to old Poppit valve, I did change it about ten years ago Hmm I think I'm due

[garbubba]

I do have a pressure gauge but it's pretty new & I haven't seen it with a new impeller, yet. Therefore I really just use it to double check. It seemed normal, as did the pee stream, I suspect cruded up thermostats and/or poppets, I'll let y'all know.