BMW Repair: a/c, compressor clutch, free wheeling

Question
2000 528I has freon in it and wont take any more but still blows warm air any suggestions  

Answer
Is the compressor working?  The pulley will run all the time the engine is, but if you see the front of the pulley being stationary, then the compressor clutch isn't engaging.

if you can't tell, try turning your A/C off, and seeing if you can see the pulley "free-wheeling", then turn the A/C on.

If it's not engaging, check the wiring.  A/C fuses, connectors, sensors, etc.

If it is turning, then you have another problem, possibly a bad compressor.  My bet is its the clutch though