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    2019 RS 2.0 AWD Drivetrain humming noise

    Recently began hearing a humming noise from drivetrain when in FWD. Noise disappears when AWD engages. No warning lights on dash. Can someone explain how the AWD engages? Is it a clutch-type system? Sounds like the AWD “clutch” isn’t completely disengaging. Anyone had a similar experience?
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