Ron I just went through this same exercise on a 97 model. I ended up installing a used blower/regulator (updated version) that I had purchased off of ebay. I have a good, new regulator (for the w140 model that is used in this modification) already wired into the wiring harness available for sale for $50 if you want to try it before you try replacing the blower. The $50 does include shipping. Just the regulator did not fix the one I was working on.

Let me know.

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Jim