My 1982 300D got to the point that the blower would only work in DEFROST mode, the far left button.
Solution: Took the pushbutton assembly out and resoldered every solder connection. Also took strips of heavy paper and cleaned the relay contacts. Verified relay contacts were getting cleaner by using an ohm meter.
Works perfectly now. Sometime in the past year I posted a series of pictures of pushbutton unit removal and disassembly.
Ken300D
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