Idle-up for A/C. Only works when compressor is engaged.articzap wrote:What sensor is on the middle of the top manifold going in a perpendicular direction to the manifold. Its kind of a brass style 2 inch long hex looking thing. When you take the sensor out its got a little push plastic piece. Mine is broke and I need a new one. If you have one of these sensors or can tell me what it is, please tell me.