2003 BMW X5 conflicting advice

The A/C issue might be something to do with the refrigerant charge, if even a small amount leaks out there can be a substantial degradation in the performance of the system. By a small amount I mean 4-5 ounces due to the limited amount of refrigerant in these modern systems. The possibility of an electrical issue is present, but if everything is working electrically, the clutch on the compressor is engaging, the auxiliary fan is working(important that it comes on if the A/C is on) and the fan is blowing air, then I would check high and low side pressures and when you do, let me know those numbers and the ambient atmospheric conditions(humidity and temperature) when these pressures are recorded.