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Could be your cooling fan. And depending on what year your car is, you could have two cooling fans. My cavalier did the same thing. The fan would try to go on when the car heated up, but couldn't. I heard a distinct humming noise with it. It didn't cause any problems until I got stuck on the highway in the summer and my car almost overheated. Take it to a service station.

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Q: What causes a humming noise while driving or idling and in any gear in an automatic transmission cavalier but only after driving for about 10 minutes?
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