The black FD01 box is the ECU/Theft Deterrent Control System.
Aside from being the stock factory alarm brain, its the thing that lets you know if your key is still in the lock cylinder when you open your door, lights up the seatbelt light if you're unbuckled, and it controls the alarm light in your center console.
From memory, those are the only things I'd consider losses when you unplug it. There's definitely no danger in unplugging it if you want to experiment with what doesn't work when its gone
Oh yeah, you can definitely remove the blower fan without having to remove the A/C lines & evaporator. It's a 3 screw operation.
Lane