My '85 300D....removed the blower from car and found that it would run....put back in car made noises (like bad bearing).....took it out.....removed the plastic cover/mount from the motor/blower.....noticed some interesting marks on inside of cover/mount.....put 1 flat washer over screw, between plastic piece, and motor itself, during reassembly......works fine......it appears that "over time" the motor and thus the blower cage had settled a bit.....the washer shims the whole assembly up about a mm or two......now blower cage does not contact plastic mounting piece when in the vertical position.

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG