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My S70 2000 developed a 'roaring' noise and a loud one when I routinely had the wheels rotated last summer. I took it back to the shop which rotated the wheels and they found no problem with how the wheels were torqued or whether they were properly mounted. I went to the local Volvo Dealer and, running up on the rack, they detected noise in both front wheel bearings (this is at about 47K miles).
They replaced the bearings and the noise persisted. It was really loud and increased in growl volume as the car slowed down to a stop. Also, it increased in volume on slow turns to the left.
Then I took the car to a Goodyear dealer to have the tires checked for belt slippage, out of round, etc., and they found that the left front tire was cupped on the outboard side of the tread. And it was not very seriously cupped either. They told me that obviously there was an alignment problem on that wheel when it was mounted on the left rear and that it would not be very audible as long as the tire stayed on the rear but that moving it to the front made it sound off thru the front suspension, steering column, etc.
Sure enough, I went back to the dealer and they found the alignment problem and corrected it.
The tire is a Dunlop and is slowing wearing the cup ridges down to a smooth surface so the noise is getting bearable now. But, while all this was an inconvenience last summer, it was also very fortunate. I got two new wheel bearings covered by warranty just before my warranty expired at 50k. Such a deal!
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