Engine rad run hot is problem when the engine overheat because over load, carrying boat, sport o or something heavy. This problem is one of chronic overheating - that is the engine overheats. The red temperature light may come on chronically, the engine temp light may be permanently over to the right hand side or it may be worse in that the rad either needs coolant and antifreeze fluid replenishment all the time or worse yet the rad "boils over".
Simply put the thermostat impedes water flow when the engine is cold, to allow for faster warm and heating of cold engines.The cooling systems thermostat is in closed position when cool and opens up to allow for cooling system water circulation when warmed up. The engine will not "blow up" if the cooling system thermostat is removed.
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