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Look on the passengers side , under the hood and find the big round part that has tubes on it at the top . You will also notice a screw on valve cover unless it's gone . That's the low side where you install the new refrigerant . If you look lower you will see another screw on valve unless it's missing that is on a thinner metal line not connected to the big round metal part . That's the high pressure valve .
You can't screw this up , because the new can of ac has a rubber tube with an end on it that will not fit onto the high valve and only will fit on the low pressure valve up on top .
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