loud noise from around windscreen area at speed

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mikemike39
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2008 G320CDI

I've recently been getting a loud booming noise which comes on at a certain speed - depends on the wind speed also.    It cuts in quite suddently at about 65mph.   I don't think it's the rubber seals around the windscreen, the windscreen was replaced a few monrths ago as it had a big stone crack, the booming was happening before and after that.  I think it's from the frame around the windscreen.   Is this something others have had and what did you do to solve it.   It's loud enough to act as a complete deterrent against going faster!!

Mike

tonyhayhighland
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Re: loud noise from around windscreen area at speed

Could it be something slapping of the bulkhead under the bonnet?

Theo
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Re: loud noise from around windscreen area at speed

might be the plastic cover of the air inlets (before the windscreen); they don't age well and then rise in the middle making an unpleasant noise at speed.

Jdring
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Re: loud noise from around windscreen area at speed

In a 463 I occasionally get more of a whistle or throbbing from the top of the windscreen which I think is the rain gutter.  Seems to depend on the wind direction.

The only boom comes from opening a rear window slightly and not having another open.... like if the folk in the rear open it I have to balance out the booming by opening another.  Luckily I have electric.

Are you sure the booming is the right description, or maybe its something from the drive-train causing a resonation of the windscreen, as a flat panel at certain speeds.

 

mikemike39
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Re: loud noise from around windscreen area at speed

Let's say if there's no wind it cuts in suddenly at 70mph - it's quite severe and seem to be from above the windscreen area, offside front

If there's a strong headwind it cuts in suddenly somewhere 50-60mph

If there's a strong tailwind it may not cut in at all below 80mph

I'm going to try some masking tape and see if I narrow it down that way

This only started last winter and I've owned it from new, 14 years now

I know what you mean about the boom from a single window being open, I don't think it's that

Cheers, Mike

mikemike39
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Re: loud noise from around windscreen area at speed

 

"might be the plastic cover of the air inlets (before the windscreen); they don't age well and then rise in the middle making an unpleasant noise at speed."

 

I will check this thanks

mikemike39
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Re: loud noise from around windscreen area at speed

 

"Could it be something slapping of the bulkhead under the bonnet?"

 

I will check this thanks

gav.helme
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Re: loud noise from around windscreen area at speed

Has it got a Sunroof?

gav.helme
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Re: loud noise from around windscreen area at speed

If it has, maybe not quite closing flush? 

mikemike39
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Re: loud noise from around windscreen area at speed

 

 

No sunroof Gav.    I had one in a Porsche a long time ago which used to whistle at 110mph and open with a loud bang at 115-120mph - was really annoying!!

I this is from the "frame" around the windscreen - not the rubber seal but the frame a couple of inches out.   I need to duct tape it and remove bit by bit to see where it's from. I think?

Cheers, Mike

tonyhayhighland
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Re: loud noise from around windscreen area at speed

Does the sound go of you open a window?