My vehicle is older, and had the same issue. For me, though, it was operated by vacuum lines. I had a small leak in an easy to get at line, and replaced it for $2. But 81MC probably knows better, if it is electronic. Mine was funny, becuase it would change with throttle input. Due to less vacuum with throttle, they'd blow in my face as I went up hills, then settle back to the window on the flats.
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