I am experiencing a humming noise from the rear that is gradually getting louder. The volume increases with speed. At first i thought it was tire noise....rotated and it didn't change. My next thought was the worse....rear differential. Any ideas? I'm thinking maybe wheel bearings??? The car is 2 years old with 65K highway miles.
Thanks,
Mike
Wheel bearing is the most likely cause. Prob a 1.5-2 hour labor rate job in the shop.
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I bought a used 2005 s60R (AWD) and have the same issue. I also thought it was tire noise until they were rotated and noise is still there. I turned off the engine while driving to eliminate posibility of exhaust or other engine/mechanical cause. Now I have not idea.
It's more of a buzzing noise (which sounds like tire tread noise) than could be caused by wheel bearings?
I have a 2004 S60R with the same noise. There is also an oil leak coming from the top of the rear differential. I guess the rear diff is gone. The local Dealership said it is the firs time they see a leak from the top of the diff, usually comes from the axle seals.
Problem is still there, don't know if there is a cheaper solution than replacing the differential assembly.
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