2006 Chevrolet Impala Thumping Noise Under Dashboard Near Ac Unit Used Only

2006 CHEVROLET IMPALA
125,000 MILES
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Thumping noise from under dashboard near ac unit, used to only start thumping when ac came on, now it starts as soon as the door opens. Also won't hold a charge recently.
Thanks
Feb 1, 2013 at 3:26 PM
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WRENCHTECH
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That is most likely a stripped out air door actuator and the door is thumping against the stops.
Feb 1, 2013 at 3:27 PM
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