Is is necessary to flush “closed loop” cooling systems that circulate an anti-freeze solution instead of sea water?
Yes, although closed loop systems keep the sea water out of the engine cooling system, sea water is still used in a heat exchanger to transfer heat from the engine cooling solution. Sea water is also used in many closed loop systems to cool exhaust components. There are many metal components in a fresh water closed loop system that require flushing to prevent corrosion and insure a long service life. Without proper flushing and winterization, sea water trapped in these components or passage ways will cause corrosion and can freeze, causing extensive and expensive cooling system and engine damage.
