I had the same noise coming from my fan blower about 1 year ago. I thought that I had to replace the motor as the sound was getting worse and worse. Then I read a post about just putting a few drop of auto transmission fluid on the bearings. I did and my fan has been noise free ever since.

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1985 190e 2.3 5spd
98 E320 16" rims
TV & VCR
+ other fun stuff!
+ other fun stuff