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I suspect Rick has a valid guess about your AC. I have never even seen a car with a dual zone system. I would be just wild ass guessing.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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