NJPontooner
New member
I have a 2016 pontoon boat with a Mercury Marine 150 engine, its been on a lake its entire life, and the last 5 years its started to overheat and sounds the 4 beeps and the engine cuts out to idle until the temp goes back down, I can observe the engine get hot on the vessel view app, in normal its at 120 degrees but then over like 3500 rpm it starts going up until it hits 200 degrees where it cuts the engine off, the Marina has replaced the impeller 2 times, the thermostat but this keeps happening, any ideas what could cause this?
