Two issues I've noticed on my W215
I noticed two things on my W215, at highway speeds (70-80mph) I noticed I can hear wind noise coming from the driver side mirror/door/window? I know the driver side door suction technology was replaced earlier in the year.
Also when the car is cold and I start it, I can hear a whining type noise in the dashboard, the air-conditioning is not on and ABC sport, airmatic is not turned on.
Any ideas?

Growling - also a good noise.
If you hear a hissing noise, that might be an issue.
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You might want to physically check to see if your window is fitting inside the rubber U-channel. I'm also assuming you know how to set your windows... front and rear. All four windows should shoot up when you close the doors.
EDIT: Also maybe check your gasket for side view mirror. Those things get torn up all the time.
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You might want to physically check to see if your window is fitting inside the rubber U-channel. I'm also assuming you know how to set your windows... front and rear. All four windows should shoot up when you close the doors.
EDIT: Also maybe check your gasket for side view mirror. Those things get torn up all the time.






