Rumbling sound from rear of Ford Mondeo 2003?

Answer 1

Pretty vague description of the problem makes it hard to narrow it down. Rear brakes could be worn and/or dragging, if the noise isn't affected by using your brakes you can probably rule that out. Another possibility is tire noise, check your tire pressure and your tread wear, is your tread wear uneven or scuff-marked? If you see unusual wear patterns, that is usually a sign of worn suspension components or the need for an alignment. Next up is road noise, does the noise come and go? If so, pay attention to when and where the noise happens. You may find the noise only happens on a certain stretch of road that has been recently repaved. And the most likely culprit, a wheel bearing. Jack up the rear wheels and remove the brake drums, (or calipers, depending on whether your car has disc or drum brakes in the rear) then spin the hub. If the bearings are bad, you should be able to feel them grinding while you spin the hubs. If the noise IS your wheel bearings, you'll want to get that fixed ASAP, and try not to drive the car too much, if your wheel bearings go while you're driving you could lose a wheel and lose control of your car. I hope this information has been helpful. Good luck!