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I misspoke in my description. The intakes are not plugged, the hose is cut and plugged inside the transom. I guess a better question would be is this adequate cooling for the upper? Also, since it is salt water, is there a need to flush the channel to reduce corrosion build up, also how and how...

Bought an 88' 230 Weekender late last summer, with merc 5.7 350 saltwater cooled via engine driven raw water pump through a seacock. No impeller in lower unit and its intakes are plugged as is water hose inside transom. Coolant discharge normal path. Will I need to provide external cooling to...