Power steering pump with clutch pulley?
I have a 2003 Ranger 4.0. and at idle i notice something clicking on and off and the idle will change slightly. So i pop the hood and look and see that the power steering pump is stopping and starting and the belt will run freely over the pulley then it will kick back in and start spinning agian.. Did some looking around and it seems as if some people will take a AC clutch and put it on their power sterring unit.. Is this what i got going on here? and if so what are the advantages of this? and what conrtols whenit kicks on and off?