What you might be encountering are situations that *mimic* a bypass:
* Compressor Clutch Failure: The most likely scenario if your AC isn't working is a failed compressor clutch. The clutch engages and disengages the compressor; if the clutch is bad, the compressor doesn't spin, even if the compressor itself is fine. This can be tested relatively easily with a multimeter. Repair: Replace the compressor clutch, which is usually cheaper than a whole compressor.
* Low Refrigerant: A low refrigerant charge will prevent the compressor from functioning correctly or at all, sometimes resulting in a cycling compressor that eventually shuts down due to high pressure. Repair: This requires an AC system evacuation, leak detection, and recharge with the proper refrigerant (R-134a for the 2001 Aurora). This is best done by a qualified technician.
* Electrical Issues: Problems with the AC system's electrical components (low-pressure switch, high-pressure switch, wiring, etc.) can prevent the compressor from engaging. Repair: Troubleshooting the electrical system is necessary to identify and fix the problem.
* Pressure Switch Malfunction: The high and low-pressure switches monitor the refrigerant pressure in the system. If either switch malfunctions, it can prevent the compressor from engaging as a safety mechanism. Repair: Replace the faulty switch(es).
In summary: You can't simply "bypass" the compressor. If your AC isn't working, you need to diagnose the problem using the above points. This often requires some basic mechanical/electrical knowledge or the help of a qualified mechanic. Attempting to bypass or otherwise improperly modify the AC system can damage other components and potentially cause injury.
