Help! Converting an AC car to non AC wiring question

Hi ACME SS
Thank you for responding. Here is what i found out in a nut shell. AC system has its own dedicated harness. Easily removed. In my 74 duster at least the fan switch plug was already in factory harness but not used because the AC harness had its own plug. And I used the existing wires that went to heater box resistor. I have not tried it yet but see no reason it would not work. The 1 remaing thing i need is to
install a fuse on circiut #3 or #4 don't remember which at the moment.
Thanks Dan