Knocking Noise - MBWorld.org Forums

Aug 22, 2007 | 05:40 PM

BenzNut4life

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Joined: Jun 2007

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02 C320

Knocking Noise

When I start my 02 C320, I get this knocking noise (in a rhythm)behind the radio. It sort of sounds like someone tapping plastic with their finger. It sounds to me like a vent or something is trying to open but is stuck. It does this for about 30 seconds or so then stops.

Aug 22, 2007 | 05:44 PM

Shake

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Joined: Mar 2007

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From: Mid-west

IS300

I get a similar noise coming from the rear. I think this problem is common on a lot of the C-classes.

Aug 22, 2007 | 09:59 PM

dnegri

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Joined: Jul 2007

Posts: 78

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From: Wilmington, NC

2006 MB C230 Iridium Silver, 2007 Hummer H3 Slate Blue

Quote:

Originally Posted by Shake

I get a similar noise coming from the rear. I think this problem is common on a lot of the C-classes.

I am experiencing that same problem from the back end. Its driving me nuts and I can't seem to duplicate the noise for the dealer.

Aug 22, 2007 | 10:03 PM

Shake

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Joined: Mar 2007

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From: Mid-west

IS300

Quote:

Originally Posted by dnegri

I am experiencing that same problem from the back end. Its driving me nuts and I can't seem to duplicate the noise for the dealer.

I think Sanf (a member here) or someone else took it to his dealer to get it fixed. They took the back wheel off and checked the area. My sound i think is coming from the right rear tire area

It only comes for like 15 seconds at Stoplights and then turns off. I don't think it can be fixed.

Aug 22, 2007 | 10:06 PM

Ryanr317

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Joined: Jul 2006

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From: Central Florida

R129, XF Sportbrake, SC400

I believe that's the stepper motor linkage issue. Mine has been doing it since i got the car last year and i've just been ignoring it. It goes away after the first few secs.

Aug 23, 2007 | 09:03 PM

dnegri

Member

Joined: Jul 2007

Posts: 78

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From: Wilmington, NC

2006 MB C230 Iridium Silver, 2007 Hummer H3 Slate Blue

That's funny....mine does it too for approx. 15 sec and it only happens at redlights or whenever I'm at idle. I describe the sound as if your tapping your finger on your desk lightly w/out the use of your fingernail. Try it......taht's what it sounds like. haha

Aug 23, 2007 | 09:07 PM

LuxuryC240

Super Member

Joined: Jan 2007

Posts: 974

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From: Boston

2003 C240

I have it too, its doesnt bother me...this was one of the first things I learned about as a MBWorld member..

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Aug 23, 2007 | 09:52 PM

sanf

Super Member

Joined: Feb 2007

Posts: 748

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From: Boston, MA

E53

Quote:

Originally Posted by Shake

I think Sanf (a member here) or someone else took it to his dealer to get it fixed. They took the back wheel off and checked the area. My sound i think is coming from the right rear tire area

It only comes for like 15 seconds at Stoplights and then turns off. I don't think it can be fixed.

yea man. there's nothing they can do. the last thing SA told me was "newer C, E, CLS...they are all making the same noise coming from the right rear area and there isn't a thing to fix it"

get into a habbit of throwing your gear to N at stop lights. that will take care of it.