Got another mystery with my 1984 190e. I noticed today as soon as I flip the headlight switch to any setting besides the 12-o-clock off position, my heater blower quits working! Soon as I turn them off the blower is right back on. I replaced the fuses for the blower and it did not make a difference. The car did have a hack job done to install a radio, but I took the dash apart and all heater control wires look fine. Anyone run into this issue before? Figured I would ask before I tear apart the dash any further to try to figure out what the hell is going on.