First find the compressor which is attached to the engine. It is a round metal piece with a pulley attached to the serpentine belt. It will have two metal tubes coming out of it. If you can't find it or aren't sure, just turn the AC on and listen for it to engage (have someone else turn it on while you are listening).
Follow those two metal lines until you get to the two tees with plastic caps. One tee is the high pressure side (usually red) the other tee is the low pressure side (usually blue). If you are buying a recharge kit then it will only fit properly on the low pressure side.
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