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2000 Malibu Sportster Overheating

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Over the weekend I replaced the thermostat and housing gaskets, took the boat for a drive. After running briefly a barefootin speeds the temperature jumped to 220+. Pulled back quickly, then replaced the impellor. That went well but still got the same temperature spike on my test drive. Any ideas on what may be going on and what I should investigate next? Is it time to go to the mechanic?  Thanks

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