I bought my '02 Boxster-S four months ago and just heard a whistle, coming from the passenger side (mirror area), for the first time yesterday....
I just took a look at the under side of my mirrors, and they have a small hole (approx 1/8") in the bottom of the housing. I assume for drainage purposes, but is sure looks suspect, when considering where a whistle is originating. Maybe I washed it too well on Sunday, and knocked the dirt out of it. LOL
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