Help ac swap needs input

[ibad57]

I installed a heat-ac unit from Limo between my front seats 72 c10 it has a block valve for refrigerant up front is r4 compressor with dryer and a dual switch pressure sensor for coolant my question is normally this system had two evaporaters up front and the rear im using do I need to make changes for not having front unit running? thought it might need sensor to shut off compressor if it becomes to cold