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Mine does this too. If you get in and start the car, which is most often the case, you will not hear it. I think this sound is normal, but most people have never listened for it. It sounds mechanical. If I was forced to guess, I would say the HVAC is powered when you turn on the radio and the sound we hear is the vents opening/closing. Someone will have the answer. Anyone? Anyone? Bueller? Anyone?
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