A/C cool but not cold?

[kna4977]

Factory A/C system converted to r134a didn't really cool at all when I got the vehicle.

I noticed some leakage/oil around one of the accumulator hoses. I opened up the system and found an extra O-ring in that orifice that likely wasn't removed from some time before.

I replaced all O-rings for all the hoses I disconnected. I tested the POA valve and found that it was setup for R12 pressures around 30 so I recalibrated it for R134a around 26 or 27 IIRC.

Sealed everything back up and vacuumed it down for an hour or so and let it sit. Was going to just do it overnight, but it turned into a couple of days. System held vacuum with no apparent leaks as the gauge readings didn't change.

I charged the system. Has nearly but not quite 3 - 12oz cans of r134a in it.

The air from the vents is cold when the system is first turned on, but as it continues to run, it gets less cold and the pressure on the high side seems to continue to climb it's was in the lower 200s last time I tested it, but it made me uncomfortable so I shut it down.

I can also see what looks like some liquid flowing through the sight glass on the accumulator.

I'm not sure if it's just still low on refrigerant or if there is some sort of issue like a blockage or contamination or ?

Thoughts/ideas/suggestions? I'm usually good at troubleshooting and solving A/C issues, but this one I'm not sure about.