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Replace thermostats as routine maintenance or only replace when bad?

eli_lilly

Member
Should the thermostats be left alone unless there is a problem or should they be replaced regularly like the water pump impeller? My gut feeling is to leave them alone, I'm running in saltwater and it's a 1993 DT150 that has no cooling problems and I'd probably just shear the housing bolts off.

Thanks,
-E
 
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