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Old 09-28-2020, 12:19 PM   #4
mike66
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City: Warwick, RI
Vessel Name: Susan Helena
Vessel Model: Albin40
Join Date: Oct 2014
Posts: 523
A small leak in your oil cooler could force oil into the coolant side. You could remove it and pressure test. And a good cleaning at the same time. Radiator shop could do it.
Broken impeller vanes or zincs can block water flow in the raw water side. Check from pump back to heat exchanger including hoses.
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