I want to share something that I hope is genuinely helpful here. I have a black exterior/interior Ram here in Houston. Temps on the dash have been 95-105 the past few days. I've also left my truck in full sun for 1+ hours on purpose for this test.
On the past three time I've tried this test, I would say that within 5 minutes of starting up and driving, my cabin is very comfortable--and here's the important part--even though my temps are no better than anyone else's here. Low 50's on the driver, mid-40's on passenger.
So the point I'm making/wondering here is that maybe getting 40/50's temp at the air vent is not the real culprit here? Maybe the temps are 'in spec' but something else is causing the system to cool inadequately?
Crossposted in other AC thread, I hope that's OK