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Re: Volvo Penta MS 2V Overheating
Typically RW goes through the tubes and the FWcoolant surrounds the tubes, but it's possible to be reversed.. it would work either way if so designed. I believe most run RW through the tubes.
If your RW flow is adequate then the thermostat and the coolant level are the first things to ensure are correct. You could confirm your FW levels are good, then run without the thermostat as a trial and see if it stays (likely too) cool... If it still heats up there's a problem with your circulation, or the H/E is likely fouled or ineffective in some way.
Also possible that your temp indication is faulty and you're not indeed heating up.. but that's a risky assumption to make...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)