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    Merc 2001 150 Optimax overheat only sometime

    "Uhh, please help. My Merc is "Uhh, please help. My Merc is giving me fits. Replaced the water pump impeller 2X, both thermostats, and still I have this intermittent problem. At high speed troll, about 1800-2000 rpm, the buzzer will go off, overheat. I can run all day if I am at cruise...
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