Ooook, So I had the tires replaced 4000 miles ago, alignment done 3500 miles ago, and I just had the car into the shop complaining about this loud whine from the rear. They claim its just road noise. It is loud. I haven't been able to check the bearings but I told the shop to and they say everything is fine. The noise starts at about 30mph and gets higher pitched as speed goes up. It makes it both in gear and in neutral coasting. It does not change with engine speed. Any ideas? This is driving me nuts. I mean it really sounds like a small aircraft overhead.
Pitch higher with the speed is just plain annoying
30 mph is mostly in traffic speed
what car and make
fwd or rear diff driven
if noise was not there before tyre change
but is there now
hard to narrow down the possibles in a forum
SOURCE: Alero loud humming/roaring sound coming from front end.
That's indicative of a wheel bearing, which is why you were told to change that out. However, it's also possible that the carrier bearings in the differential (where the drive axles attach) have gone bad. That happened to me on my 300ZX several years ago, and I had to replace the diff bearings. I would have them checked out somewhere other than a dealer (you'll probably get a better price from an independent shop).
As a sidenote, to be sure it wasn't a wheel bearing, if you hear it quiet down in a turn one way but get louder in a turn the opposite way, it's likely the wheel bearing. If you turn left at speed and it gets louder, then it's the right bearing (since you're loading up that side of the car). If it gets quieter in a right turn, it's the right side (you're unloading that side of the car and not putting as much weight on it, so it doesn't drag as badly). See if you get that symptom just to be sure that the wrong side front wheel bearing wasn't changed.
SOURCE: 1996 Audi A4 Quattro has a noisy rear differential
It's the wheel bearing. Guaranteed. Just replaced mine. Go to Audiworld tech articles for step by step instructions on how to test the wheel bearings. They must have been put in wrong last time or they just went out again.
SOURCE: Ford F150 2004 4x4 passenger side rear wheel noises
You can try the bearings but I think if you take off the rear rotors and look at the emergency brakes you'll find the problem. You might want to ride the emergency brake a little in lieu of removing the rotors to confirm the problem. Also some wheel covers make noise-drive without them and see if it helps.
SOURCE: high pitch whining sound from engine
Check the power steering fluid if its low it could cause this. Also could be alternator, water pump, ac compressor, or idler pulley. My bet would be on the idler pulley, its the one that keeps the belt tension constant. Remove the belt and check this pulley for slack also spin it by hand.
Good luck, dont forget to rate.
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