Noisy blower motor.... You may be able to buy some time by cleaning and lubing the bearings. I took mine out and sprayed some WD-40 on the shaft. It was quiet for about 8 months (but it smelled like WD-40 for a couple of weeks). I need to do it again, but I want to try something different. I want to try a product called deoxit (which is for electronic contacts) to remove the oxidation, then a spray lubricant with a solid lubricant additive -- PTFE, graphite, molybdenum disulfide, or something. Something that doesn't smell too bad.

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1987 W201 190D