Noisy Tire Solution

Tires offer a number of trade-offs. Loud tires provide superior tread wear and a harsher ride, are loud. Soft tires provide a smooth ride, quiet operation and usually fewer miles.

Please go see your Goodyear or Firestone or Continental (or other major brand) tire professional and discuss your concerns with him or her to find the best tire for your application and driving style.

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flat tire light

Your cobalt should still be under warranty, so you should bring it back to the dealer. If you have done massive driving and your out of warranty, then il'd have to say that you may have a wheel bearing hub gone bad and needs to be replaced. Check the tire pressure first, tire condition and look for any signs if tire damage like tire belt separation. Tire belt separation is when the steel belt in the tires that keep the tire it's shape has broke and there is a flat spot causing the wheel shimmy. If your not sure,rotate the wheel by placing the front wheels to the rear and the rear to the front, making sure the tires are properly inflated to the recommended PSI. Good luck and start with checking the tire first. 

please can you specify whether the sound comes from the engine or the tyre or some other part of the car

Just had dealer suggest turnng tires inside out on rims. I experienced at least 60% immediate noise reduction. Unfortunately, wasn't aware of this trick with the first set. This was second set of tires with only 30,000 miles and intolerable noise. Dealer says more improvment in next 1,000 miles driving. I saved buying a third set of tires with only a total of 73,000 miles. Hope this information helps someone else.