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Porsche-O-Phile Porsche-O-Phile is offline
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Join Date: Feb 2004
Location: A Rock Surrounded by a Whole lot of Water
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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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Old 10-21-2006, 06:30 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)