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When I turn my ac up high, I hear a vibrating sound coming from one of the vents. It vibrates more if I turn it up higher. What could this possibly be?

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1 Answer 1

The vent fan blades may be hitting something, such as part of the fan housing or a bottle cap.

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I thought about that. I will have to check. –  Xaisoft Sep 22 '11 at 20:03
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