I'm replacing the blower motor on my 91 245SE, which has been making noise for a year or so, and progressively getting louder.
As part of the project I bought a replacement resistor as well, figuring the old one might be in pretty bad shape after 260K+ miles. I bought an MTC resistor because it was way way cheaper than OEM. From what I've read on Art's site, the weakpoint in the cheap resistors is the wiring, not the resistor itself, so I figured I could always splice in the factory wiring.
I've got it all apart now (ugh, been working on it all day...), and the original resistor looks great. No sign of overheating, and the shielding on the wires isn't hard or discolored at all.
I'm inclined to reuse the original resistor, especially since I've got to do this job on the other 240 soon as well, so I might need the new resistor for that car, but what is your opinion?
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