E-Class (W211) 2003-2009

Weird pumping sound and hissing sound (Left Front Tire)

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Old Aug 23, 2009 | 10:03 PM
  #1  
Pekkle's Avatar
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From: Los Angeles, CA
2007 E550 Sports
Weird pumping sound and hissing sound (Left Front Tire)

Today was the first time I have heard of this type of pumping and hissing sound at the same time coming from left front tire side but I know most likly came from either the engine compartment or inside the quarter panel after I shut off the engine from a short distance trip. I originally though it was the airmatic pump, but after I tried to rise the car the car and it would rise normally and the pumping sound continuted for a couple more minutes and finally stopped.

Now I am puzzled what that sound could be? It sounded like you are pumping air into your tire from a 12v portable air pump and the hissing is like you are releasing air out of the tire, but both sound were not as loud as the actual tire air pump and the hissing was a much softer or slower.

Any idea or guess what this might be? I was so affraid whatever it was it's going to burn out..
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Old Sep 4, 2009 | 05:20 PM
  #2  
Pekkle's Avatar
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From: Los Angeles, CA
2007 E550 Sports
No body ever heard of this type of sound before? It's very very strange because I have no heard of it since then, but I am affraid when the warranty is over this thing will resurface.. and cost me an arm and a leg.. any idea what this might be or has anyone heard of this kind of issue before?
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Old Sep 5, 2009 | 11:55 AM
  #3  
Barry45RPM's Avatar
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From: Ft. Lauderdale Area, USA
2015 ML 350
Airmatic equalizing the pressures/heights.
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Old Sep 5, 2009 | 11:59 AM
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Vik888's Avatar
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From: Irvine, CA
2008 E550, 2012 GL450, 2014 GLK350, 2015 S550, 2020 GLC350e
How long have you had your E550?

I have an 08 E550. I hear it all the time. Its the Airmatic system.
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Old Sep 5, 2009 | 12:05 PM
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From: Ft. Lauderdale Area, USA
2015 ML 350
I had a 500 from 11/03 to 2/07, & the 550 from 2/07 till today. They both randomly discharge or fill when started or shut down and a door is opened.
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