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humming

  1. A5 General Q&A
    Hey All, Now...when i put the air conditioner on low (1, 2 or 3) i hear this low humming/hushing sound from the vent...its not much, but it seems like a change in the gas pressure, when i talked to the audi dealer he told me this "basically theres a small radiator like behind the vent where it...
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