C220 2014 - Rear Cabin Whirring/Buzzing Noise As Revs Climb`

IbrarM

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Hi People,

Been forced to create this account so that I can be armed with more info when MB take a look at my car next week.

Essentially as the revs climb, 40mph + to 75mph a noise starts building, from the rear cabin. It's like whirring, buzzing sound that gets louder and louder. I cannot be sure if its the rear left or rear right side of the cabin. I have had the noise identified by MB but never diagnosed.

It's gotten to the point now where over the radio i can hear the noise, whirring away.

When I bought the car, from MB, the noise was present but it was faint and not very loud. It could easily be ignored but over time it has gotten louder. So some component is slowly being worn down/away to the point where it is sound signature is now becoming more and more prominent during the drive on the mway

if there any ideas or tips I can try out to further diagnose the issue then please let me know and I will be sure to try them.
 
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IbrarM

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could it be the engine mount? or the bearings on the rear wheels?

My car when bought had around 37k on the clock and now has 42k on the clock. So it's a low mileage vehicle when i bought it.
 

LostKiwi

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Possibly a loose heat shield rattling. We just had that on the r230.
 

Taffy7hfa

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Climb in the boot, get someone you trust, wife etc :rolleyes:o_O to take car for a spin and have a listen with a long screwdriver.
 
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IbrarM

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Climb in the boot, get someone you trust, wife etc :rolleyes:o_O to take car for a spin and have a listen with a long screwdriver.
Hallo, sorry I am not sure what you mean? What part does the long screw driver play in this escapade?

= )
 
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IbrarM

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Possibly a loose heat shield rattling. We just had that on the r230.
Sorry, did not mean to do a hit and run on these forums - I will keep this mind, The car is booked in for this Friday. So let's see what MB say. Any other ideas what it might be? I am thinking it has something to do with the bearings or around the tyres. As the noise is directly related to the rev counter. As soon I speed past 75mph, I cannot hear it anymore or the pitch of the noise has changed and i cannot detect it so well.

Any other ideas are greatly appreciated.

I am gonna try putting the MB engineer in the boot lol! when we go for our test drive. If they fail I am based in the Bradford region so the next stop will be take it to local specialist.
 

LostKiwi

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As the noise is directly related to the rev counter
Be more specific...
If its related to road speed then yes tyres are a possibility (especially if they are V patterned).
If its related to RPM (drop a gear and see if the noise changes) then it won't.
Wheel bearings are unlikely at that age unless its done a million miles.
 

Taffy7hfa

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Hallo, sorry I am not sure what you mean? What part does the long screw driver play in this escapade?

= )
Sorry, yes, I should have explained that better, it's possible to use a screwdriver like a stethoscope by holding the handle end against your ear whilst holding the blade end against whatever the area you think the noise may be emanating from (an inner wheel arch for example)
it sometimes works very well on engine parts, although I'm not sure that going for a spin in the boot of a car is a very sensible thing to do....just the sort of thing I do ;)
 
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IbrarM

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Hi, just wanted to post a follow up reply - it was a rear bearing that was causing the issue. Was sorted and replaced by warranty.

Thanks folks.
 


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