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I have a 2006 cobalt, it has 80,000 miles on it. It started just making a kinda of a whinning/roaring noise under the hood. Its fine til I get up around 40mph and the noise doesnt change when I shift my manual 5 spd trans or let off the gas. But when it drops below 30 mph the noise disappears? When I do get above 70 the noise disappears. It has good tires. The noise is comming from the front engine or transmission area. Could my fluid be low on my manual trans? Front wheel Bearing?? Thanks for anyones help.
 

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I had a weird noise coming from my car one day. It turned out that a little rubber ring, on the interior side of the fire wall, under the pedals, had popped out. I put the ring back in and the sound went away... take a look under there check that out.
 

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I have just started having the same problem. The noise is like a constant roar that does not change with speed and starts up about 30 MPH. I have checked my tires for bubbles but they are all OK. I have noticed a mild vibration/shaking in the car at the same time/speed. I'll chek out that rubber ring under the pedals thaat was mentioned but if that is NOT is, what could it be?
 

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When my bearing went bad on my old car it Was a lot more than just noise so I would assume its not the bearing. You say the tires are good, but is the rim ok? I've had a slightly bent rim before and it would be fine till I got up to about 50 mph then it would start shaking on me and making noise. Other than that, you should check all your fluids, just to make sure...
 

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Has somebody here got this problem repared? I have the same problem on my cobalt coupe ls 2006 and have no idea of what it can be. If someone got it repared, can you tell me what is this problem and how much it costs?
 

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I had the same problem today, sounded like a hissing sound. Checked the rubber ring and it was off, so I shoved it back in and it was all better.
 
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