What could cause the engine to overheat?
Low coolant, bad water pump, dirty radiator etc.
A thermostat that's stuck open will trigger the check engine light. From a cold start the engine must reach normal operating temperature within a certain amount of time, usually 9 minutes. If not the check engine light will be triggered and a trouble code will set. A thermostat that's stuck open won't allow the engine to reach operating temperature. Hope that helps! Jim
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