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Old 23-07-2018, 06:44   #1
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Join Date: Jul 2016
Location: West Palm Beach, FL
Boat: Catalina 470
Posts: 1,131
Raw water contamination of fresh water cooling loop.

After some overheating issues caused by a broken hose clamp, I noticed that, even though I leaked some coolant, I did not need to top off the fluid. This made me suspicious that there might be a leak in the heat exchanger, so I pulled it all apart this weekend, and pressure tested the HE in a tub of water using a shopvac on blow. Sure enough, I saw bubbles coming out where they should not. So I'm getting a new HE from Mr. Cool, but it got me thinking whether there are any other issues I might see as a result of the contamination of the fresh water loop? I'm going to put in a new thermostat for sure, but could any damage have been done that is not currently evident? The coolant that I drained was still green from the antifreeze solution, so hopefully this helped to inhibit corrosion in the loop.

Any suggestions would be much appreciated...
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