On the roof console above the mirror is the air sampler. Its a small fan you might be hearing? For the first few years I owned the car I thought it was a microphone for the MB telephone.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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