What Is A Closed Cooling System Mercruiser?
A closed cooling system for Mercruiser is a cooling system that circulates fresh water through the engine and exhaust manifold, which then passes through a heat exchanger before being discharged overboard. This system helps prevent saltwater from circulating through the engine’s cooling passages, reducing corrosion and extending the life of the engine. It also makes it easier to winterize the engine as you need to only drain the coolant from the heat exchanger.