In a Half System (Block Only) closed cooling system, the treated fresh water is circulated through the engine block, thermostat, expansion tank, heat exchanger and circulation pump.  It is not routed through the exhaust manifold(s).   Raw water which has removed heat from the engine through the heat exchanger is then injected into the exhaust manifold, from which it flows to the exhaust elbow to quench the exhaust.

  This system does not provide the same degree of protection for your engine as a FULL (Block and Manifold) closed cooling system, but is generally easier to install, less expensive, and may be the only option available if your engine's pump capacity, electronic control system, or other factors prevent a FULL system from being safely installed on a particular engine or boat.

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