Find the air compressor located on the engine and follow the two metal tubes coming out of it. One tube is the high side and the other is the low side. Keep following them until you find a tee with a plastic cap. The red cap is the high side, the blue cap is the low side. If you're trying to re-charge the AC then the recharge fitting will only go on the low side, it won't fit the high side on purpose.
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