HI!!
Find the compressor and follow the thicker line/hose coming from it. On an A/C System, the Fat Line is the Suction or Low Pressure Line and the Skinny Line is the Hi Pressure Line. The Low Pressure Service port is usually located by the passenger side fender well next or on top of the filter/receiver/dryer (a metal cylinder device). The Low and Hi pressure service ports are different so there is no way you can hook up wrong the charging hose.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.
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