Wes, G-Benz, thanks for the scoop. I figured it was that.

My aux fan is off, and when standing by the car with the hood up, the radiator fan appears to be blowing back over the engine, so it seems all is in order.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black