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Humming noise under rear seat
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12-26-2000, 08:54 PM
mbdoc
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Yes there is a pneumatic pump under the seat, shouldn't run unless the is a bleed from the lumbar seats or the engine isn't running. Then it provides vacuum assist. Also runs for central locking.
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