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If it is plumbed correctly the thermostat should modulate to maintain the 180f temperature. I would replace the thermostat first. They cost about $4.00.
vettst.
The lower priced marine engines without closed cooling system run 140f thermostats, if not the salt would plate out on the engine and the passengers would close off. Not all engines are used in freshwater.
If the engine has a closed loop cooling system it should operate 200f.
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