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Wind Noise or Resonance form the boot/rear end

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Hi.

Ive only had my Yeti since Saturday but it has already developed a wind noise or some sort of resonance form the boot / rear end. Its kinda like someone blowing on the top of a bottle or a bee stuck in a jam jar and starts at 20mph and gets worse with speed. It did not do this on the test drive or all the way home (about a 2 hour drive).

So, my worst fear is a wheel bearing? Its a 2WD with 42,000 miles so I would not expect a wheel bearing fault already. Ive checked under the carpet and nothing is loose there so I don't think its a rattle.

The only thing i can see with the boot door seal is a missing rubber foot on the left side of the plastic contact point where the boot closes against the car (would be bottom left when shut).

Ta

This probably won't help at all, but this is a Skoda technical bulletin on wind noise, perhaps you need some Spezial Gleitmittel :think:

Customer statement / workshop findings

Disturbing noises are heard from the door seal area.

Driving noises coming from the door seals or window guides mostly occur after these parts have been treated with lubricants or other chemical agents and the surface finish has been damaged.

Then, driving noises coming from the window guides may occur caused by micro movements of the flocked window guide surfaces towards the body.

Technical background

In all Škoda models manufactured at present, the door seals and window guides are treated against freezing to the painted body parts and against driving noises.

It is the surface treatment involving clear matt paint, which can be affected by improper treatment with a chemical agent or car care products.

Production change

Measure

Therefore, we do not recommend treating door seals and flocked window guide surfaces in particular with lubricants and chemical agents!

While treating painted body surfaces do not apply chemical agents to window guides and minimize their application to the body surfaces being in contact with the window guide or the seal.

To eliminate driving noises caused as described above, we recommend thoroughly cleaning door seals and window guides from dirt and then applying a very thin layer of the lubricant Spezial Gleitmittel, Ord. No. G 052 172 A1.

I'm sure there's an old post ,somewhere on here, about an air vent with a rubber flap?

It can cause noise ( blowing raspberries)? :giggle:

Don't eat beans before you go out in the car :giggle:

Might be worth checking that the number plate isn't loose and vibrating.

S

  • Author

I'll check the number plate - good idea. I cant find anything in search for a rubber flap tho

There's a thread called "Low Flying Chinook" it was about a similar noise which was caused when one of the windows was open a little bit.

Wind Noise or Resonance form the boot/rear end

I think a few of us suffer this, MarieK being a lady of course excluded :giggle:

Wind Noise or Resonance form the boot/rear end

I think a few of us suffer this, MarieK being a lady of course excluded :giggle:

Nearly a sending to the corner one there :giggle:

I note Bob has posted yet!!

  • Author

I suppose I did leave an open goal there with the wording :)

The dealer installed the raised boot floor yesterday and the noise is still there so it must be something outside the car. I'll check the numberplate at the weekend but I doubt there would be enough wind passing the rear (ooo-er missus) at 20pmh to bother that.

Last nights job was the application of a yeti sticker as per new profile pic - Grrrr :)

There's a thread called "Low Flying Chinook" it was about a similar noise which was caused when one of the windows was open a little bit.

This is my thought. Check your rear windows are properly closed.

The other possibility, which I know the Octavia suffers with, is 'saw tooth' wear on the rear tyres.

This is caused with long use with the tyres either just rolling or braking, never driving. Run your fingers over the tread blocks; if they feel smooth one way but coarse the other you've got it. Solution, subject to tread depth, is to switch the rear tyres side-to-side, so they then rotate in the opposite direction, or do this but diagonally front-to-rear.

Guy

  • Author

could be tyres. one thing I did when i got it was to inflate the tyres. my guage was saying 25psi all round so i inflated to 30/32 as per the petrol cap. hmm. wonder if this could be it.

Hi Paul. If I am not mistaken, you have already found the answer to your noise problem.

The only thing i can see with the boot door seal is a missing rubber foot on the left side of the plastic contact point where the boot closes against the car (would be bottom left when shut).

I checked our Yeti and the missing rubber foot that I think you are referring to is an adjustable "spacer" and matches the one on the right. Look carefully and you will see that it is a adjustable [friction held] device that helps to spread the pressure of the boot hatch evenly against the boot seal. With one of yours missing, the boot hatch will twist very slightly and not seal as it should. Hence an air leak which will begin to sound as you increase your speed to the point when a negative pressure is created behind your vehicle.

Hope this helps............Tony

  • Author

Rubber foot replaced and that's not fixed the noise.

Garage checked the wheels today too and they are fine. Their conclusion was the tyres. I am wondering how long they were run at 25 psi. The garage also said they were quite old and cracked - might be the original opens from new. There's not a lot if wear left in them so maybe they should be replaced.

As I said, the noise was not noticed on the 2 hour drive home when I bought it. But then the next day the car was washed and I also topped up the tyres to the right pressure so it would fit with the subsequent arrival if noise.

I might drop them back down to 25 and see what happens.

  • Author

Also those friction feet on the boot - they cannot be moved. I tried to pull one out and it wouldn't budge. Superman was busy so I gave up.

Rubber foot replaced and that's not fixed the noise.

Garage checked the wheels today too and they are fine. Their conclusion was the tyres. I am wondering how long they were run at 25 psi. The garage also said they were quite old and cracked - might be the original opens from new. There's not a lot if wear left in them so maybe they should be replaced.

As I said, the noise was not noticed on the 2 hour drive home when I bought it. But then the next day the car was washed and I also topped up the tyres to the right pressure so it would fit with the subsequent arrival if noise.

I might drop them back down to 25 and see what happens.

Don't drop, the pressures to 25psi - that's way to low. They should be around 30psi (IIRC).

If there's not much tread depth left, they're a bit cracked and have been trolling around on the back for 42,000 miles; seems like a perfect reason to get new ones!

Also those friction feet on the boot - they cannot be moved. I tried to pull one out and it wouldn't budge. Superman was busy so I gave up.

The " feet" are adjusted by removing the cover, which will reveal a Torx srew, once slackened this allows the foot to slide in or out. If you do not have the correct Torx bit, an Allen key could be used instead.

  • Author

Don't drop, the pressures to 25psi - that's way to low. They should be around 30psi (IIRC).

I was just going to do in temorarily to see if the noise stopped.

I friend was in the car today and we both agreed it sounded like a bumble been in a jam jar.

Ive spoken to the garage I bought it from and am trying to convnce them that they shoul dnot have sold it like this, and they owe me 4 new boots. Heres some pictures I'm about to send them as evidence (they asked for them). You can see the poor condition of the tyres.

post-1129-0-48649600-1366050009_thumb.jpg

post-1129-0-70740300-1366050040_thumb.jpg

post-1129-0-88828600-1366050062_thumb.jpg

post-1129-0-68425800-1366050091_thumb.jpg

Those tyres look shot to me. Today I replaced all 4 tyres on my mums 11 year old, 40,000 from new Golf. The Golf tyres were less cracked. I did notice that tyre noise was less on the new rubber ( contis).

Are the photos just of the rears?

The tread blocks on the shoulders look saw toothed to me. General tread depth wise they look barely legal and would attract an 'advisory' if being MOT'd, if not a fail.

It wasn't a Skoda dealer you bought from I trust?

Guy

Sent from my Xperia S using TapaTalk 2

  • Author

All 4 are like this. The pics are from two if them that had the light on for photos. The other side was in shadow. I expect this is why they lost pressure too.

No not a main dealer. I'm annoyed that I missed this when buying but a combination is 25psi Bd all the tyre dressing hid it a little.

  • Author

Just heard back from the supplying garage and their 'technician'. Apparently tyres in this condition ("weathered") are fine and they are happy to sell cars with tyres in this condition. I feel like a fool for not being more thorough when I bought the car now as this is likely to cost me another £500 :(

The tyres are shot.

They aren't "weathered", they are battered.

I know the car has done 42K and i'd expect them to be worn but for the rubber to have perished how it has is surprising.

Are we sure these aren't some part worn junk they've chucked on?

I think you now have a choice. Do you

a) take further action against the garage getting the trade association they belong to, trading standards etc. perhaps first getting it inspected by the AA / RAC. involved or

B) swallow hard, shrug your shoulders, remind yourself that you knew it will need new tyres sooner or later and you paid a fair price all considered, buy some new tyres and move forward.

Guy

Sent from my Xperia S using TapaTalk 2

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