Typically the the low pressure/suction line is a bigger pipe/tube, as far as location it depends on the car. The bigger AC line is almost 99 percent of the low pressure. Usually on the cap it will say most of the times to there is a different hydraulic fitting for the low and high side. Most cars I have seen have a little tag that will say suction or low pressure line, and or discharge high pressure.
If you are re charging the gas, always use the low pressure side of the system.
I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_54ae41aaaffbab00
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