No, the fan is supposed to be off when the car is off.

That fan is called the aspirator motor, and it is probably actually behind the side passenger air vent, if it is the same as the W124 cars.

It sucks air up through the vent, through the headliner and down to the screen you see by the rear view mirror. The air temp sensor is there for the climate control.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".