[brcidd]

Very common failure mode when system refrigerant charge drops below half of under hood specified amount due to a leak in your system. Seen it hundreds of times, on numerous body styles. There is only enough refrigerant to boil off in the evaporator inlet side which just so happens to feed the passenger side of your vehicle. If refrigerant charge level was adequate, both inlet and outlet sections of evaporator would be capable of boiling refrigerant, and both side of cabin would be cooled. So best to confirm this, by recovering and weighing refrigerant, this confirms you have a leak, so then find and fix your leak, repair it, evacuate the system and recharge to specified amount and be cool.

Big Hint- most common leak location in 2001-2002 U-vans is the condenser lower right hand corner (passenger side) -where bracket weld cracks/breaks away and tears the header open-- you can see oil residue from 6ft away if condenser is the original one-- note original condensers are black in the front- replacement condensers are aluminum and not coated or painted.....so is yours the original?