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Dog-faced pony soldier
Join Date: Feb 2004
Location: A Rock Surrounded by a Whole lot of Water
Posts: 34,187
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Defrost engages the a/c compressor. If the belt is a little loose, it could be slipping on the compressor. Try checking the belt tension or you can run just the a/c to see if the symptoms can be produced that way.
Does it sound like it's coming from the engine bay or the fan motor area?
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Black Cars Matter
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