It does this by restricting the flow of coolant from the radiator to the engine at a certain temperature level. Bad thermostatĪ thermostat is responsible for regulating the temperature of your engine. That said, there are other possible causes that can cause the issue. Now, we know that 98% of the coolant temperature sensor is the most common cause of engine coolant over temperature on a Ford Fusion. Other Possible Causes for “Engine Coolant Overtemperature” The coolant temp sensor is known to fail in most ford vehicles, usually caused by water/coolant leaking into the sensor itself. If this sensor fails or becomes loose, it will throw up the code, usually followed by a p1229 (cylinder head overtemperature). The Coolant temperature sensor is responsible for monitoring the temperature of your engine coolant. The most common cause for this issue is a bad coolant temperature sensor, as Auto tech, I would say this is the most common cause of engine coolant over temperature on a Ford Fusion. What Causes Ford’s” Engine Coolant Overtemperature”? Bad Coolant Temperature Sensor This is a very common problem on ford fusions and can happen for a number of reasons, which I will discuss below. The error fault code simply means that your Ford has detected that the temperature of your engine coolant is too high.
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