The beast has the automatic "climate control" the bete noir of the German car. What a nightmare. I tore into the w116 1979 300SD and found squeaky blower. Wife had not mentioned squeak which just started. It was lucky that I chased that issue first as you will see. Removed glove box and passenger upper kick panels. After some time (1.5 hours) I had the blower removed having fought with a captive nut that had come loose. It was one of 3 holding motor/fan to heater box. There was NO bearing play. I started with shooting WD40 into the motor and let it drift to bearings on top and bottom. Tested. Less squeak. More WD and some 3 in 1 oil was generously applied. Squeak gone.....and voila......the blower now switches off which is what I was after in the first place. My theory is that the WD40 acted as a cleaner to clean out the commutator grooves that may have been shorting. That is what was keeping it running. Anyone disagree????? Since it was running fine I did not replace brushes. I do not know how much brush is in there. I do not know if squeak was from bearings or from brush-comm. I now have car back in service......as before only 2 states: Defrost using full speed blower for heat. I deep-sixed the Chrysler loser "servo" years ago so no a/c which is fine with me. I should have torn out a bunch of pneumatic, elect, boxes, etc. Maybe next time.

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Dionysius