About five years ago my fan stopped working on my '90 300E. I bought a new motor to put in it. I removed the old motor but was not able to remove the fans from the shafts to swap them to the new motor.

So....I turned the old motor by hand a bit and put a little oil on the shafts.

I put the old motor back in and it has worked perfectly ever since.

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2012 E350
2006 Callaway SC560