Humming tune from rear NOT tyres!

**patomlin76** · 16-05-2013,11:05 PM

Dsg, just so happens I am nearly down to empty so can do this check tomorrow. Would the pump make such a racket when on the move, such as what I am hearing?

Failing this ill be in the unenviable position of trying to source a wind issue which manifests itself at just 20mph!

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DSG4ME · 17-05-2013,09:44 AM

Originally Posted by patomlin76

Dsg, just so happens I am nearly down to empty so can do this check tomorrow. Would the pump make such a racket when on the move, such as what I am hearing?

Failing this ill be in the unenviable position of trying to source a wind issue which manifests itself at just 20mph!

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Possibly, although mine used to get masked by the road noise tbh, it was when I was sat idle I used to hear it but it made such a frequency it used to make my ears buzz by the end of a shift.

**patomlin76** · 17-05-2013,09:47 AM

Cheers, checked out as per your guide, all seems fine. Looks like I'm on the hunt for some wind resistance...

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**patomlin76** · 21-05-2013,01:09 PM

Update:

Wind noise did not make sense with VW (took it to a main dealer who got a technician to test drive it for me), you wouldn't get intrusive wind noise in a car at 10mph at the depth we were hearing.

They suspected a wheel bearing starting to wear but admitted they had heard much worse.

Took it to a mates garage (for mates rates) and they definitely say bearing, but which one they don't know. When it's booked in next week they will strip the rear pads and spin the wheels without the friction of the brakes, they think they've already identified the near-side rear.

It's all making more sense now because 4 weeks ago I didn't have any noise at all, and it's gradually got worse that it's there at 10mph and very loud at 30-40mph. Unfortunately I can't get the work done before my trip to Cornwall this weekend but I've been advised that whilst annoying, it is not yet dangerous.

Thanks...

**zollaf** · 21-05-2013,02:41 PM

not dangerous unless it does happen to collapse, lock up and your wheel falls off. yes, this did happen to me once after i ignored the warning signs.
thats an awful long way to go on something thats a ticking timebomb.

**patomlin76** · 21-05-2013,07:01 PM

Zollaf, that post was enough for me to argue with Toyota that they'd missed them first time round, VW and another have both noticed it, so a 'forceful' call later and they've got it tomorrow.

Thanks !!

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**patomlin76** · 04-06-2013,02:00 PM

Quick update!

Both Toyota and a local specialist had the car on the same day before we went on holiday and both said it must be normal traits of the car. I argued back that it most certainly wasnt - if it sounded like this on a test drive I would have walked away. Toyota also claimed that because there was no noise whilst spinning and no wobble, then they would not be able to do a replacement under warranty as it was still 'functional'.

As a result I'm getting the rear bearings properly tested (i.e. rear brakes stripped off to isolate any noise) and then replaced. The local garage near me have been very good - they immediately heard the hollow hum on a test drive and suspected bearings on one side, as the tyres were brand new (also a sawtooth sound is more like a rumble). Funnily enough, every other garage that has tested the bearings have just done the simple spin and wobble check. It seems obvious to me that you really need the friction of the rear pads out of the way first!

I think this will sort it given the characteristics of the humming sound but regardless I can't see any other option - (especially given the mates rates I've been given for them to be replaced) - It's not tyres, it's not wind noise, it's not the lift pump. I'm now just paying to get it sorted myself!

**Teflon** · 14-06-2013,05:33 PM

I won't re-post the entire strory, but I've just experienced something similar and cured it. Maybe yours is the something simliar? Wierd Tyre Noise - here's a puzzler

**patomlin76** · 14-06-2013,07:02 PM

Thanks Teflon, I read your post but guess mine is even more of a puzzler than yours!

Because it's not rumbling. It's a hum. Definitely!

As it is always present, though louder on rougher roads, I am thinking that it may well be the bearings, but at such an early stage that no inspection nor spinning of wheels can prove.

It has new quiet Dunlops on the rear and Pirellis on the front, all brand new. So it definitely isn't saw-tooth wear!

Think someone blowing over an empty wine bottle or something - deep hum from 10mph upwards.

Nothing else has changed with the car externally so it can really only be from the rear wheel assembly. If it were only happening at higher speeds I'd agree that sounds can travel, but doubt they can travel so convincingly at a low speed.

I'm now resigned to living with it for a few weeks and waiting for it to get worse, that will force the warranty company to replace them!

Now this is a puzzle!!!

Paul

**Gaz_burns** · 19-07-2013,12:54 PM

Mate, I have exactly the same issue with my golf 1.6 TDI. Been chasing it for a year now. Had it checked by Indy garage and rotated tyres, no better. Trying to find a garage with an electronic chassis ear that would allow us to pinpoint the exact source of the noise, but have so far no located one