You will see that with the engine running and the A/C off, the clutch on the front of the compressor is not turning but the pulley behind it is, with the A/C on and the compressor working the clutch will engage with a fairly loud click and the entire front of the compressor is turning.
July, 31, 2011 AT 12:47 PM
To add to this. Just because it may be engaged wouldn't mean that it is working correctly either. The whole system would have to be analyzed using dual pressure gauges.