Question about 2006 Chevrolet Cobalt

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06' Chevy Cobalt Noise Issues

My car makes a rattling noises when i drive over bumps or bumpy roads like there is something loose under the car. It also makes a humming noise while the engine is on and gets louder when the ac is on......It just sounds really raggedy when I've only had it for 3 years with no accidents.......

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