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My guess would be servos doing something with the flaps when the fans are shut down. I think it is normal because mine has done that since I got the car over 3 years ago. I tried searching but couldn't find any information about that noise. The system our car uses does have an audi logo on it so maybe you could find out more information based on that. You can actually see some of the servos moving if you look up under the passenger side of the dash while you change A/C settings.
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