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Old 09-08-2009, 09:47 AM   #1
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Soft Top Noise at Highway Speed

Yesterday on the road at about 70+ MPH, we noticed a very annoying low frequency noise on our 09 Unlimited X with the factory soft top. It was one of those kind of pounding noises that you feel as much as you hear. We pulled off the road to check & didn't see anything loose.

We continued on down the road and found that the noise was directly linked to the Recirc position on the A/C. With recirc on, we got the noise. Turn the Recirc off and all is well. Weird.

I would have to guess it has something to do with changing the pressure inside the vehicle due to the change in air flow with the Recirc.

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Old 09-08-2009, 10:12 AM   #2
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It's called wind buffeting. Crack one of the rear windows and it will go away. Better yet, skip the ac and take the top down.

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Old 09-08-2009, 11:04 AM   #3
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^ Agreed. It's due to the pressure differentials between the inside and outside air, and so forth. Crack a window, toss off a door, or drop the top- Mark W.
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Old 09-09-2009, 02:04 PM   #4
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Sounds like a helicopter!!! Crack the window or turn on the vent fan / AC.
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