My engine driven fan (with the clutch) stops spinning after 2 or 3 revolutions of the fan after turning the engine off. I have never heard the auxiliary fans run once the ignition is shut off, no matter what the engine temp. My Audi does keep the fan on sometimes if it is hot enough, but the MB doesn't seem to do that.

My car is a 91 300D 2.5.

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1991 MB 300D 2.5 Turbo (207000km) (now gone)
1993 Audi 100 CS Quattro (300000km)
1999 VW Jetta TDI (290000km)
2002 Audi A6 3.0 Quattro (150000km)
2005 MB E320 CDI (34000km)