Extreme Vibration - Rear Windows Down

[Plati]

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[Yupster Dog]

That's caused by standing waves in the airspace that form at the resonant frequency of the cabin interior geometry. Kind of how a like a pipe organ makes sound. The note (frequency) is determined by the cavity space.

It is caused by a lot of air coming in and none going out. It raises the air pressure and sometimes even makes your ears pop. When the air pressure inside gets greater than the air pressure pushing in it makes the interior air pressure (for lack of a better word) burp out. The burps cause the cavitation. If you crack the front window you give another escape for the inside air pressure without the burps.

 

[99WhiteC5Coupe]

These don't have rear vent windows, FYI.

My mistake. Thank you.

You mean Ford has eliminated a very useful feature on the 4th generation models of the Expedition?

 

[aggiegrad05]

We've hashed this out before:

Severe air vibration when front windows open

I get severe air reverberation in the cargo area when front windows are down and driving at a moderate speed. I know if i lower the rear windows that reduces it, but is there any other way to reduce. In my old armada i could open the rear side panel windows remotely to reduce.

www.expeditionforum.com

 

[Trainmaster]

Ready for this? That's a Helmholtz Resonance.

Read about it:

Explained: That Weird Throbbing When You Open One Car Window

Why is the wind buffeting so bad when one window is rolled down in your car?

www.caranddriver.com

The third generation trucks had mention of "wind buffeting" in their owners' manuals.

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[5280tunage]

My mistake. Thank you.

You mean Ford has eliminated a very useful feature on the 4th generation models of the Expedition?

sadly, I would have liked to have had that for sure. Always loved those on other vehicles.

 

[Yupster Dog]

I would have thought wind buffeting was listening to a parrot head after a Jimmy Buffet concert.

The interaction between the two masses of air produces vortexes that compress and decompress the air, producing the throbbing effect.
umm, isnt that what i said but without the ****** content.

 

[tommyddsr]

My granddaughter likes to ride in the back with the window down. I can only take it up to about 35mph, then the helicopters arrive At that point the windows go back up,

 

[Modelcarguy]

It is a design flaw with ALL Ford trucks and SUV’s. So say a buddy of mine who was a plant manager (retired) at the KC plant for many moons.
The designers expected everyone to drive with the climate control system running 100% of the time. (Meaning glass up and either AC or heat working.
In other works they all do it to some degree or another. The only way to “fix” the issue is by trying to find the sweet spot of just how far you can lower the glass, open the rear side windows or sun roof etc.

 

[b17drvr]

Totally normal. Every vehicle (36 of them)I’ve had since the 1970’s does that.