I have a 2012 chevy sonic 1.8L. 126,000 miles. I recently replaced the fan because I realized that the low speed wast working. I found this out by using the AC this past summer. The thing is once my car is up to temperature, the fan will kick on but it won't shut off after that unless I shut the car off. The fans are not running when the car is cold, only when it gets up to temperature. The fan doesn't shut off once I reach temperature it just runs on low and then high. It's not overeating. I have an analogue water temp gauge and it's cooling the engine, according to the service manual, the fan should toggle back to the low speed at a certain temp. However, even after it reaches said temp, it remains spinning at high speed. There is no check engine light, therefore nothing for me to go off of. Could it be a coolant temperature sensor that's reading out of spec, but not so significantly that it would trip a code, but just enough for it to keep the high speed fan on even after it cools down?
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