Just an additional point of information re: the blower. I was just tortured when my 1990 300e momentarily lost all electrical power while driving on a local street. It turns out that the culprit was R-15. The base of the resistor's receptacle had worn away and allowed one of the leads carrying voltage to make contact with the vehicles body. This killed the blower regulator and the ignition switch. I recommend removing the base for R-15 and inspect the underside for cracks and wear. The regulator you save may be your own.

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Achieving failure is no accomplishment, yet learning from it is.