If you are not getting voltage to the compressor clutch with the a/c on, this does NOT necessarily indicate an electrical issue? The most common cause of this situation is a low refrigerant charge which opens the low pressure switch, interrupting the compressor circuit.

I would advise that you do not replace the compressor until such time that you get the radiator back in the car and filled with coolant so that you can run and properly diagnose the a/c system. In the vast majority of a/c problems the compressor is NOT the problem. If you remove the compressor at this point, you will contaminate the system and require a relatively involved procedure to get everything back as it should be.

I suggest that you take things one step at a time and properly diagnose the system. After the car is running again, connect manifold gauges, and go from there.