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Welcome, I'm Chris (aka Moose).
Front AC works great?
Rear air you can change the temp and the blower speeds work, you just can not get super cold air?
Have you done any diag or repairs yet?
After reviewing your past question history, I do not feel like I will be able to provide an answer you would compensate me for. I am going to opt out and let another help.
Best of luck.
Does the rear AC only blow hot or can you change the temperature slightly?
Does the air only come out the floor vents or does it come out the headliner vents? Also see if you can change the temperature in the rear if any?
There is an electrical temperature blend door motor mounted in the rear the controls the air flow either over the heater core for heat or the evaporator for cold air. You will have to replace the temperature blend door motor to fix the problem. It is located in the right hand rear of the vehicle. You will have to pull the inide right rear trim panel to access the actuator to replace it.
Does the center AC have an evaporator and heater core also?
See if there is an expansion valve, inline drier or a fixed orifice tube in line.