Does the car have COMAND or not, and is it pre MY2005 facelift (i.e is COMAND CD based), or post (DVD widescreen COMAND)
Hard to diagnose remotely, but it could be the fan in COMAND (which should power off after a while) or possibly the fan in the aircon temperature sensor (has fan to suck air in) but I'm not sure whether that is in the over-head-control panel or on the main dashboard on a CLK.
Richard
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