The computer mistakenly assumes the engine is cold, even when it is not. It is also common for a coolant temperature sensor to fail without warning and send permanently cold signals to the computer. And the response of the computer may unbalance the timing and fuel calculations. If the coolant temperature sensor malfunctions, it can transmit a false signal to the computer. Poor fuel economy is another symptom that indicates your coolant temperature sensor is malfunctioning. This causes the computer to erroneously counterbalance the signal, thereby causing the engine to misfire or overheat. At times, the coolant temperature switch may fail such that it starts transmitting hot signals permanently. If you notice that your engine overheats, the coolant temperature sensor could be the problem. Symptoms of a Bad Coolant Temperature Sensor Overheating Engine These symptoms should alert you of potential problems with your automobile and push you to have it checked out thoroughly. This post discusses some of the common symptoms of a bad coolant temperature sensor. And this implies that if the coolant temperature sensor malfunctions, it may translate very quickly to engine performance hiccups. This occurs to prevent overheating, which can damage the engine severely.Īs you can see, temperature plays such a crucial role in the performance calculations of your engine. If the computer detects that the engine’s temperature is too high, it will automatically scale back engine performance settings. Most automobile engines require more fuel when they are cold but require less when fully warmed up. This includes changing the engine’s timing as well as the fuel calculations for premium performance. The signal generated is automatically transmitted to the computer so that necessary changes can be made. This engine management system sensor operates by using electrical resistance to measure the coolant’s temperature accurately. The coolant temperature switch – otherwise known as the coolant temperature sensor – is primarily responsible for monitoring the engine coolant’s temperature. What's up Ford? Never had such a bad experience before with an almost new vehicle.A coolant temperature sensor remains one of the most vital engine management sensors. We have a rental pickup provided by Ford in the meantime.Ĭan't believe it's taking this long to get a part. Dealer says all they know is the part is "somewhere in North America", but they have no idea where or when they'll receive it. STILL no part and it's going on 3 weeks since the problem arose. Bummerĭealer advised problem was a faulter coolant sensor. There is nothing that would make it overtemperature in those circumstances. How can the system think the coolant is "overtemperature" on a truck that hasn't been driven for 12 hours in weather that is below freezing? We are in the Toronto Canada area,and there a lots of 150's driving around here. In between those 3 times it started, there were many attempts where it did not start. After that I was able to start the truck 3 times and each time the "Overtemperature" message displayed. We plugged in the block heater for an hour. It's the coolant that existed in the truck when we bought it. The coolant is at the proper level, neither low nor high. The temperature indicator on the coolant icon is to the far left - ie. This was first thing in the morning in a temperature below freezing (in Ontario Canada in the winter) and the truck had been parked all night. The message displayed was "Engine Coolant Overtemperature". Yesterday morning the truck would not start. We have a 2016 F150, 3 months old, with 6100 Kms on it.
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