Loud roaring noise from front end driving above 20 mph

170

Asked by Nov 19, 2014 at 07:54 PM about the 2008 Chevrolet Cobalt

Question type: Maintenance & Repair

I have a 2008 cobalt, 5-speed. It also is making loud noise when driving above 20mph. I
took both front wheels off and run the engine with the car in 5th gear spinning both front
rotors. It was making the noise but then i stopped one of the rotors from spinning allowing
the other to spin, then the noise for really got loud. Does anyone know if that wold be
something in the differential or transmission.?

6 Answers

17,380

Could be just that or it could be a really bad wheel bearing.

the wheelbearing could be the problem one way to check is putcar on jackstand and with the tire on move tire upand down and see if there is play in it if so wheel bearing is out

3,625

Most likely a wheel bearing or axle shaft or both. They start going at around 100,000 miles and make odd noises and vibrations. I think it is unlikely you will be able to detect a bad wheel bearing by moving the wheel up and down. If you have the resources pull the front end apart and do both axles and both bearings and you'll be good as new again. (if that's the problem). When changing bearings buy the best ones available. The replacement ones never seem to last as long as the factory original ones.

3,625

Having said all that you really should do a little more trouble shooting to rule out transmission or diff problems. The fact that it gets louder when you stop one wheel makes me wonder.

170

Found bad front wheel bearings, replaced both sides and problem fixed. Thanks

17,380

Cool, glad it was something easy and not the transmission!

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