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Originally Posted by xavier405
Also it happens mostly when the cold A/C is blowing and it is hot outside. But not always!
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I think it has more to do with the difference in outside/inside pressure more than just temp. It has happened to ours when it is cooler outside but the car was parked outside so the cabin was very warm and the A/C kicked in and caused a pressure difference.
You may notice the top flaps a lot more if you turn on the re-circulate button. That happens with A/C and heat. Try it some time, especially on the freeway, and see what the difference its. We had a Jeep Wrangler and it made a huge difference in the amount of noise in the top. When it was set on normal mode, you could look in the driver's side mirror and see the windows bubbling out and the top was pretty quiet. Put it on re-circulate and the windows would suck in and the top flapped like crazy.