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the fan will stay on even whene the engine isn't calling for it. also, the fan might not come on at all, even though the engine is overheating

In my 1997 Jeep Grand Cherokee 4.0 litre I6, out of the blue, the engine was stalling, blowing strong fumes, and when I would accelerate, it acted like the transmission was bad, and barely driveable. If you get stranded you can try to locate and disconnect the coolant temperature sensor while the vehicle is running, then plug it back in and shut the car off. When you restart the car, the engine light will be on, bypassing the sensor. Your car will be driveable again, and seemingly back to normal. You will have to replace the sensor and have a mechanic reset the code before it will pass emmission tests. On my Jeep, the connector for the sensor is right above the fan and accessory belt (very easily accessible). Be careful when you disconnect the sensor on the Grand Cherokee while it's running, because it is very close to the belt and fan. I have heard of Saturns having the same problem. Well, hope that helps!

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Q: What are the symptoms of a bad engine coolant temperature sensor?
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