volvo md2b raw water cooled
I have a 5gal. tank that I keep filled with fresh water with a intake line running to a 3/4" two way valve that can select from either seawater or the tank. This has worked fine with no problems. Even the thermostat stays clean. I have a good size raw water strainer installed right after the seacock. I still replace the waterpump impeller and seals every year. The flow out the exh. should be constant,with a gush of water every 3 seconds or so.