a/c system

Same problem with my daughters car, compressor was making a jingling metal sound, with the car turned off, the center fuge that is part of the compressor pulley just spins freely. I haven't taken the compressor out yet but wondering if the that is what your compressor was doing too? I recharged it, all was good but it would not blow cold air. I was thinking it could be the blending door in the plenum, but when you turn the dial to hot, hot air blows out. Please let me know so I can get a better idea of what is causing this.