You will need to more clearly define the fault.
Typical faults are:
1) Blower motor does not work
2) Blower works, loss of temperature control (always hot or cold, can't adjust)
3) Loss of control of the air outlet (wrong outlet)
4) Normal blower and outlet control, but no cooling (acts like control is in VENT)
Each symptom has a separate set of causes, some of which might be interrelated
Outlet selection control is strictly vacuum operated. There is nothing electrical in that portion of the system.
Air temperature blend is independent of the control of the MODE switch. It is, however, supplied by the same fuse that enables the Heater Blower Relay (CJB F23).
Blower motor operation requires the ignition switch in RUN, the mode switch in any position except off, CJB F23, Blower relay energized, CJB F37, the blower motor, and the ground return path which consists of the blower speed switch and the resistor pack. The resistor pack is not in-circuit in HI speed.
Compressor clutch requires the blower motor relay energized, cycling switch and high pressure cutout switches both closed, A/C WOT relay NOT energized (controlled by PCM), the A/C clutch relay energized when the WOT relay is not energized, and the clutch coil.
As noted the same fuse (CJB F23) also protects the backups, turn signals, shift interlock on automatics, and a few more circuits.
Pick which symptom you're trying to repair for focused help.
Steve