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Why does my 300 Searay Sundancers port engine overheat on a plane? 2005 Sea ray 240 SunDeck

Boat Model: 2005 Sea ray 240 SunDeck
Location: Merritt Island, FL Submitted on July 5, 2019

Emile
Merritt Island, FL

Cruising at 27 knots down the river and the temp on the port engine slowly rises and stops at 175 then slowly keeps rising until I get the overheating alarm

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