After leaving the car off for a few hours, and starting it up, the AC always works 100%, the fans blow very nice cold air and it can last 20+ minutes. Sometimes it never stops working fully (yay) but usually, when it's really hot (or humid maybe), the output of the vents slowly reduces until it's barely a trickle coming through (feels cold still, if set to cold). Meanwhile I continue to hear the blower motor going full blast and I haven't touched the controls at all.
Blower motor and a bunch of sensors were replaced as well as the control console for the climate system. Also had coolent drained and recharged, there were no leaks. Compressor seems to work perfectly fine. Switching vent controls from head to feet 'work' but you can barely notice due to the limited airflow.
I've already had about $2500 put into this issue and the Honda dealership has so far failed to reproduce the issue nor fix the issue.
I'm at my limits on suffering through drives with a failing AC system. I do not want to bring it back to the dealership as I cannot trust them and already threw away enough money there. Is there anyone who may actually know what the problem may be?
My running theory is something is freezing up internally. I've had mild success ramping the heat all the way up for a time to then get the cooling system to push a little more airflow through but it dissipates quickly and is objectively not at all worth suffering through the heat blast. Heating works fine in the winter, if that matters.
Edit: Pending repair of expansion valve