Five or six years ago, the blower motor in my 1990 300E got to where it would not run sometimes, and then not at all. I bought a new motor without the cages, intending to reuse the cages. I removed the blower from the car. The shaft was very hard to turn and it was obvious why it would not run. I was not able to remove the cages, so I simply tried putting a few drops of oil on the shafts and turned the shaft by hand to work the oil in. I reinstalled it in the car and it has since worked perfectly for all these years.

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2012 E350
2006 Callaway SC560