Help: I have a Marinette 32 Had it 6 mo. Refurb to almost new ? Well spent lots. My latest issue is the engine is heating up the oil guage is peged . Yet the engine runs smooth . I turned it off before it passed 240 f. I noticed there was no antfr. I added antifr. then noticed it coming out of the exhaust. I was told there must be a crack in something for the coolant to get into the system to come out of the exhaust. I don't know this system is this something I can replace ??