what is the problem with the coolant system.it will get cold on the passager side.but not on driver side or the rear

way to much refridgerant added! you need special tools and gauges to do A/C............... they will detect leaks too. take it in for a service. you may have done more damage. they can remove excess amount the right way to the right level

This van a suspect has dual (side to side) climate controls. Check controls. If are in correct position a blend door in heater box may be bad,test before throwing parts at it as some parts in the hvac system can be sssspppppeeeennndddyyyyy!