GMC Safari Air Conditioner Blows Hot

My Ac Is Blowing Hot Air. I Am Getting A High Pressure Reading Over 80 Psi With Car Off And Car Running.

I Turn On A/c I Have No Problem But It's Pouring Heat. Behind The Driver Side It's Hot It Feels Like It Is Coming Out The Side...

When It Is Hot Outside About 85 And We Run The Ac The Van Will Slowly Stop Accelerating, Starts Off Anything Past 3/4 Throttle And 1/2 And...