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Follow the AC tubing from the compressor. The port is located on the metal part of the tube. It has a plastic cover over it (maybe) and is about 1/2 inch in diameter. There are two ports. (one on each tube) The recharge port is, I think, the smaller of the two, but don't quote me.
If you're having trouble, it's worth taking the car to a shop that does AC work, and ask for a checkup. You might have a leak which you can't detect. The shop will put dye in the refrigerant that will show up at a leak source. Most mechanics do NOT recommend using a leak sealer as it can further damage the system. Some mechanics will not evacuate a system that has sealer in it, as it's damaging to their equipment.
I just went through all this on my Saturn. It took 3 replacement compressors before I found a good one. The first leaked, the second just didn't compress very well, and the 3rd is seemingly OK. I went in for a leak check on it just yesterday. All is well and the system is cooling. Some things you just can't do yourself due to legal restrictions or the availability of expensive equipment.
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