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Discussion Starter · #1 ·
Greetings all,<p>We have been hearing a noise coming vaguely from the rear of the car. It is a high pitch (for a car noise anyway, I'd guess 3-4K Hz) that comes on at certain speeds. It comes on at around 59-59mph, and goes away by 63-64 for example. It sounds a little bit like rain squeal, but it never gets very loud--if you aren't paying attention, you might not even notice it, but once you do notice it, it can be pretty annoying--and it doesn't need rain. It doesn't seem like what I think of as being a wheel bearing noise--no grinding sound, and not affect by weighting/unweighting one side of the car. And it's not tire related. It can be affected by lifting off in the middle of its sound, and getting back on the throttle again. So it seems like a gear noise, except that it is coming from the rear, which is undriven, under normal circumstances, right?<br>We're taking it in as we are in the waning days of the warranty (2005, 30K miles), but I don't expect the dealer to be very motivated and was hoping to give them a nudge.<br>I did a search and looked through the TNNs, but didn't find anything useful.<br>Anyone have any thoughts?<p>Thanks,<br>mandd
 

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Re: Noise from rear of V70R (mandd)

I had my rear hubs replaced a few months back after similar symptoms, though mine didn't really seem to go away when increasing speed and it may not have been quite as high pitched. I had originally thought it might be the rear diff whining, but with the new hubs the noise disappeared.
 

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Re: Noise from rear of V70R (mandd)

Cupped tires. <p>I just discovered the same thing. Annoying as hell, you should have heard the racket they made when I put them on the front!!!<p>I had heard some strange noise, but didn't know what it was until I rotated the tires. Now I do!!<p>
 

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Re: Noise from rear of V70R (mandd)

could be a bad bearing, or one going bad. Seems to be a pox with these cars...My left rear went on me at 45/50K, and made a similar sound at exactly 60 mph....when you next hear the sound, try swerving the car left, then straight, then right, then straight again. If the sound gets louder swerving in one direction, then it's a bearing on the opposite side of the car (e.g. if louder when swerving left, the right bearing is the culprit).
 

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Discussion Starter · #6 ·
Re: Noise from rear of V70R (Denis)

Thanks for all of the thoughts.<p>I think I can rule out tires, because the noise has remained through the recent winter/summer tire swap I optimistically did last weekend.<p>I'm leaning toward hub/bearing. The rear wheel bearings have already been replaced once (at 13K (!) miles), so clearly they are suspect.<p>It is at the dealer now, so we'll see how it goes.<p>Thanks again!<br>mandd
 

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Discussion Starter · #7 ·
Re: Noise from rear of V70R (mandd)

Oh, I forgot to mention, I have done the swerving back and forth, and that does not affect the sound like I would expect for a bearing. <p>mandd
 

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Re: Noise from rear of V70R (icebiker)

Both my bad bearings were constant sounds that varied in volume with speed. Not pitch. <p>Nor did it "come and go". <p>But yes, tire swap would rule out tires and point toward a bearing.
 

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Discussion Starter · #9 ·
Re: Noise from rear of V70R (mandd)

Well...<br>I've heard from the dealer. They say it is a bent driveshaft contacting the body, which they have ordered to replace under warranty. They couldn't figure out how it got bent as there were no signs of anything amiss in the area.<br>I'm happy they are replacing the shaft, if it is indeed bent, but I really don't see how it could cause this noise. <p>We shall see.<p>
 

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Re: Noise from rear of V70R (mandd)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mandd</b> »</i></TD></TR><TR><TD CLASS="quote">Well...<br>I've heard from the dealer. They say it is a bent driveshaft contacting the body, which they have ordered to replace under warranty. They couldn't figure out how it got bent as there were no signs of anything amiss in the area.<br>I'm happy they are replacing the shaft, if it is indeed bent, but I really don't see how it could cause this noise. <p>We shall see.<p></TD></TR></TABLE><p>Strange... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/sly.gif" BORDER="0"> I don't understand how that could cause the sound under the conditions you described, either. Hope it comes back quiet!
 

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Discussion Starter · #11 ·
Re: Noise from rear of V70R (240S40)

*****UPDATE****<p>Well, it didn't come back quiet. I wonder if there was anything wrong with the driveshaft at all. But the dealer was good about it. I didn't have to argue with them about the noise being "normal" or anything like that, even though it was pretty subtle. <p>The real answer is...<br>Angle gear!! <br>We had no awd problems, no other symptoms recently. Just the noise. Back in July we had a leaking angle gear that the service writer claimed was replaced but now looking at the parts list of an actually replaced one, I'm pretty confident wasn't. So the real question is: Is this a new failure mode for the angle gear? Yikes!
 

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Re: Noise from rear of V70R (mandd)

I can not imagine a "bent" driveshaft, or bad u-joint that does not give vibration. <p>I think the noise detected angle gear failure may be a first, and must be a result of worn bevel gears as opposed to failed coupling.
 

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Discussion Starter · #13 ·
Re: Noise from rear of V70R (rogersampson)

I agree. I've driven a car with bent driveshaft, and this didn't feel like it. I must admit though, that we have a slightly bent Peg that could disquise it. That being said, I was not able to discern any difference in the way it drove after the driveshaft was replaced. If I had been paying for this, I'd be pretty upset.
 
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