2016 merc 115 hp 4 stroke model 1115f131d
by Mr. Bob
Had for 3 years just started having , problem I can take off from dock go a few miles run about 5300 the guardian mode kicks in showing 170 degrees soon as I cut back to 4200 or 4500 it immediately shows 128 degrees, as long as I stay between 4200 to 4500 no problem, Since I have changed thermostat, sensor still doing it, changed water, pump never took it back out going to this week end. I hope that was the problem. oh by the way this is on a 24 ft. pontoon boat.
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