Agreed. The fader resistance does not meet the needs of the blower controller. However, it is possible to take the fader apart, remove everything except the wheel, and attach the wheel to a small potentiometer. I did some experimenting (see the attached pictures) and determined that such a mod would work but only those with some shop skills and small fingers would be able to pull it off.

You could move the fader to the switch panel above the PBU but you need a position where the next place is unused, because the fader with an external pot will be too wide for a single switch position. The nice thing is that the only part that is visible is a factory part. [The Zebrano panel is from my junk box; I don't know what the round hole was used for.]

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970