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I have a 2004 60hp mercury 4 stroke. Overheat alarm came on 2 weeks ago and I replaced the thermostat and its pissing fine. Has been running fine until yesterday.Went out yesterday and alarm went off until I slowed down and went off a few more times while idling in. Has new water pump also. Any suggestions. Its a steady alarm not a intermitting one.
 

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Check block temp with a melt crayon. Pull lower screens off lower unit make sure you didn't suck sand dirt or weeds in cooling on outboard is simple. Has the impeller ever been changed?
 

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exhaust divider plate gasket. It's an easy fix.
 
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