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You're absolutely right about me getting the systems mixed up. So I think I have it now.... there are 3 water systems. The engine cooling systems which feeds from the drive, the graywater which feeds through the seacock, and the closed freshwater tank. That would have been a nice surprise if I...

Thanks again to all who responded, the sterndrives.com link was great... Its definitely the raw water cooled Merc Bravo III- no radiator fluid. There is only one seacock (that I could find) and its mounted into the hull in front of the engine, I assume it leads out to the drive where it picks...

Thanks Ken- I think you are right a busted impeller is the only cause that makes any sense. I'm still learning my way around this cooling system so I was just blindly guessing. If the impeller is busted, is it possible that the marina wouldn't have noticed that when winterizing/summerizing? That...

Hello All, Thanks in advance for any troubleshooting advice.... I bought a 2003 260 Sundancer last year and had a lot of trouble with overheating. A lot of things were tinkered with by a mechanic last year but eventually we decided it was a temperamental thermostat, because the problem...