Answer
Apr 20, 2023 - 06:39 AM
A Fresh water cooling system cools a marine engine protecting it from the seawater which will corrode the iron or aluminum block and possibly the manifolds. For the purposes of this answer, sea water (colloquially known as raw water in the marine industry) is what the boat is floating on regardless of its salinity. It is also known as the the surrounding water source. Antifreeze (colloquially known as fresh water) is circulated through the engine much like it would be in a car. The heat exchanger used to transfer the heat takes the place of a radiator in a car in this instance. It is a sacrificial element of the cooling system in a boat providing a barrier between the raw water and the engine’s water jacket and exhaust.
