S500 Noise When Accelerating - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 11-02-2007, 07:16 PM Thread Starter
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Date registered: Apr 2004
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S500 Noise When Accelerating

2001 – S500

I’m hearing a noise from the front passenger side under the hood. The noise starts when I start to accelerate (moaning noise). When car is in Park or Neutral its fine as soon as I start to accelerate the moaning start and seems to disappear when I start to hit 50 MPH. Anything above 50 and its fine. When the car drops below 50MPH the sound comes back.
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