I was looking my self the other day. It should be a schrader valve, "it looks like the valve on your tire." there are two of them in the system. If you have a 2.0L 4 cyl, the low pressure line is on the metal ac line coming out of the fire wall. " passenger compartment"its about 2 feet from the left. It should be the larger diameter tube, it should have a plastic screw on cap. The high pressure schrader valve is on the hose that runs under the power steering reservoir. Good luck.