I have had this whistle for about a month now. I thought at first it was because of a leaky vacuum hose in the trunk, however that is fixed now, and it still squeals/squeaks continuously. I do believe mine also stops when the controls are turned to Off.
I'm curious as to what this might turn out to be!

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D