A/C malfunctions and blows ambient air

When I turn the A/C on, it blows ambient air (no cooling of any kind). So, I hooked up the gauges to the lines and got extremely high pressure on the low side and normal pressure on the high side. Then, I visually examined the compressor and its clutch. The clutch spins regardless of whether the A/C is on or off. In other words, when the car is running, the A/C clutch is also running (constantly). It appears that it has been doing so for many months. After depressing the schrader valve, little to no refrigerant escaped. I evacuated the lines multiple times, and it did not hold pressure. After each evacuation, excess oil came out along with the air and moisture, and the pressure would not hold after 30 to 45 minutes. I suspected that there was a blockage in the low side somewhere (perhaps passed the TXV on the way back to the compressor). I now suspect damaged compressor/clutch assembly and maybe the condenser as well. I got these parts ready to be replaced. The heater works, and I am able to switch to the A/C side (where the heat stops but no cooling occurs) telling me that the actuator and blend door are working (right?). I am wondering if the TXV or Evaporator have anything to do with these symptoms? How about the pressure switches?