Buzzing from CLS 500

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Mjwscorpio

New Member
Joined
Dec 15, 2014
Messages
26
Car
CLS 500
Just noticed a buzzing noise when engine running, no idea what it is, obviously noticeable when stationary with no radio on. Any ideas?
 
The engine?
 
Airmatic pump ?
 
Poorly bee?
 
Does it have ABC and is the noise coming from the o/s front wing ? if it is it could be the pulsation damper.
 
is it coming from the rear view mirror area?
 
Is it the SBC pump priming?
 

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