Fresh charge and still not cold

First of all, excellent summary. You knocked out a lot of questions that I was going to ask.

You have two issues. The compressor not coming on sounds like the PCM is not grounding the relay to command it on. We check this by putting your meter on voltage, putting the red lead to battery positive, and the black lead to pin 85 with the engine on and AC on. The PCM should provide the ground which will show 12 volts on your meter. If you don't have 12 volts then the PCM is not grounding that circuit. Which means you have a wiring issue to the PCM or the PCM is faulty. There is a chance that the pressure switch is telling the PCM to not turn on the compressor so we need to check this as well. Basically if you have a scan tool, you can monitor the PCM data and see what that switch is saying. Then you will need to check the PCM and make sure it is getting the bus message from the HVAC module to turn on the AC. This should all be in the live data or monitors section in the PCM on your scan tool.

As for your pressures and temps. I attached the chart and it looks like the low side is a little high and the high side is ok. Based on this I would think the compressor is just weak. Was the compressor replaced with an OEM part or aftermarket?

At 85 degrees, for the vents to blow in the 60's for an aftermarket compressor, you may not get it much better. An OEM part, I would expect low 60's maybe even into the 50's if it is in the shade. These vehicles are almost 20 years old so I have seen very few vehicles that can blow in the low 50's or even 40's like today's vehicles can when ambient temp is in the mid 80's or higher.

Basically what I am saying, is you may not be able to get this to drop the low side 5 more PSI to get it inline. If we can, that may get the temp to drop a few more degrees.

However, let's start with the control issue and then tackle the other.

Do you have a scan tool that can monitor the PCM data? That is the easiest way because is a 3 wire sensor that basically provides the info via the 5 volt reference system. So there is a 5 volt feed wire, reference wire, and then signal wire. We can monitor the voltage but it is easier to just see what the PCM is seeing.

I attached info on this sensor for your review.

When you were checking this in the PCM was the AC from the control panel turned on? If it was then the PCM is not getting the signal from the control panel to turn it on. I doubt this is the cause of it not blowing as cold as you expect but you did mention at first that the compressor doesn't come on by itself and you have to jump it. So that is why it is saying no to AC request. The request is coming from the control panel in the passenger compartment.

Does the panel seem to operate and the AC light come on when you press it?

Correct. Your issue as far as the compressor not coming on is from the HVAC control panel (which appears to be functioning) to the PCM. Basically you are not getting the signal to the PCM to turn the AC on. That is either from the HVAC module not actually sending the signal or you have a wiring issue so the signal cannot get there. This is a bus message so testing for voltage is not going to work. You want to remove the connectors at numbers 2 and 3 on the wiring diagram and test for resistance/opens or shorts and if the wiring is okay, I would put an HVAC control module in it.

It is unlikely to be the PCM because it appears you have proven that out because I believe you commanded it on with the scan tool? If so, then the PCM is capable of turning the compressor on, it is just not being told too turn it on.

Does this make sense?

Just checking but does that sensor that you unplugged have 2 or 3 wires?

You are correct that the low pressure sensor is just an on/off switch that is normally closed. Basically when the pressure is too low it opens and the compressor shuts off. So it is unplugged, it would go open and the compressor should not run.

However the pressure sensor is a 3 wire sensor that would make more sense if unplugged would allow the compressor to run. The reason is, when unplugged it should go to 5 volts which tells the PCM that the pressure is not high. When close to 0 volts that means the pressure is too high and it will shut the compressor off.

Take a look at the attachments and let me know what you think.

Yep. I think you nailed it. You are more then welcome. That is why we are here. Good job. Please come back next time you need some help. Thanks