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Hello and thank you for your questions,Can you tell me what your working on? Year, make and model please?
Thank you for that, The low side suction service port is in the suction side line coming off of the compressor which is the lager line a few inches back from the compressor. See the link below, copy and paste the link to your browser to open and view it. I have marked it for you.https://dl.dropboxusercontent.com/u/104923897/Low%20side%20May%2031.pdf
Can you tell me your pressure reading on both the high side as well as the low side with the AC on and the compressor running?
In order to determine why the system is not cooling properly as you have mentioned you need to start first with installing a set of AC gauges and read the system pressure. Are you able to do that?
Normal pressure on the high side and the low side with the compressor off should be right at 100 to 110 PSI. With the compressor running at idle you should see 35 to 40 PSI on the low side and right at 200 to 225 PSI on the high side. If you reading 55 on the low side with the compressor running that would indicate you are over charged providing the high side pressure is in the correct range. The problem with the cheap charge kit is the reading are not as accurate as they should be.
The suction side is suppose to drop while revving. Before you discharge anything you really need to check the high side pressure.
Hello is there a reason why you requested a new expert? Ron has answered both of your questions from what I can tell