When the Air Conditioning is turned on . . . if the face of the AC compressor face spins . . . it is good. If the clutch face doesn't spin when the AC is turned on . . . it is usually caused by 1) Low refridgerant pressure 2) a bad relay in the fuse box or 3) the AC clutch is not grounding or it has failed.
GM, Pontiac, Toyota, Vibe, Matrix, AC, Air, Conditioning, Compressor, Clutch