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Old 04-03-2008, 09:30 PM   #1
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A/C making thumping sound??


so when I open up the grill to change the filter for my A/C, I see to air ducts. A big one, and a small one. I'm assuming the big one is for the heat/AC and the small one is the 'air freshner/air cycler.'

The smaller air duct is closed by a shutter/damper. every often, the aircycyler would operate and the shutter would open up. For some reason, it opens up halfway, and then slams shut to make a big thumping sound.

Any idea how to fix this??

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Old 04-04-2008, 10:53 AM   #2
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A/C making thumping sound??


try WD40 on hinges?

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