Hello group, I'm puzzled by an overheating issue. Had to remove the water heater (Seaward Products unit, plumbed in "series" with engine freshwater cooling system) to remove and replace an old, failed battery charger. Prior to doing that, my W50 would run at 180 degs. Whether it was for 15 minutes or 15 hours. It would only creep above 180 if left at idle for an extended period. I've owned the boat for two years and thats always how its behaved. After putting everything back together, the cooling temp will head north of 180 degrees in 6 or 7 minutes. It was easily past 200 and still climbing when I shut the engine down after first noticing the issue. First thought was I had a leak. None found. Next I suspected I had air trapped in the system. After everything cooled off, I left the pressure cap off the freshwater manifold tank and cracked the petcock on the thermosat housing and ran the engine below 1200 rpm for 10 minutes or so, looking for signs of gurgling air and burping fluid from either place. Nothing. Shut it down when the temp approached 200 and still climbing. Raw water flow out the exhaust is normal. However, I can see no evidence of water flowing in the manifold tank. Seems like I should see some sort of flow? I'm thinking either I'm not correctly addressing the airlock theory or I have somehow acquired a blockage. Time to do an entire cooling system flush? Any and all suggestions would be greatly appreciated. Thanks! Scott Prior Ties #273
_________________ Scott #273
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