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Or, it could be a piece of insulation stuck in the fan, which is typical for older boxsters. It gets dry and pulls away. The fan is located above the passenger footwell. All you have to do is pull down the cover under that area and have a look with a flashlight, removing any you find with a pair of needle nose pliers.
Someone recently wrote a thread about this (1-2 months max). You might do a search.
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