I think I just might "marinade" on this decision for a while.
If there is debris in there, I'll give it about a week or so to work its way out.
If not, then I think I'll try and figure out how to get in there and examine if there is something stuck in there hitting the fan.
If no debris is present, Does anyone know if there is something to lube? If not, I'll consider replacing the whole assembly.
Did I read correctly when you said that the wiper assembly needs to come off to examine the fan?
Seems like an awfully strange place to start, but it wouldn't suprise me, you know, MB German engineering and all...
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".