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The overheat code is a non sticky code, meaning that as long as the engine is not overheating, it will not be going off. If you are still getting the overheat light on the key switch, something is blocking the water flow around the temp senders. Remove the thermostats, then with the engine on a set of muffs, start if and let it idle for a few seconds. Make sure that you are getting good water flow from the t-stat holes.