maverick4415
New member
I have 671 TIBs (485 hp) in a 44' sportfish...port engine is overheating...just cleaned out raw water side of cooling system and replaced hoses and impellers - no leaks when done and plenty of water flow out exhaust...bring boat up on plane, and it runs at 178 for a couple of minutes, then creeps north of 180, and within seconds starts climbing up over 200...as soon as it goes over 190, I start bringing it back down to idle and it comes back to 180...I'm thinking because of how quickly it climbs, I have a thermostat that's sticking closed...don't think it would have hovered at 178 at all if it wasn't getting enough raw water through system....BTW - a couple of years ago I had a thermostat problem on the other engine except, in that case, it was stuck open and running too cold...thoughts from the forum??