Heater fan ?

Nobody hazards a guess. Anyway went and added a wire "B" on the harness to blower motor. I have new harness their because I switched from 3 way wiper motor to a 2 way, so bought new harness and 2 way switch and wipers at least have 1 speed. The blower motor works on a/c switches and defrost, didn't seem to work on heat. I'm thinking the blower motor is tied into a/c compressor somehow. My diagram does not show blower motor connection, the whole thing is very confusing. Any thoughts.