Blower motor works fine but can not get it to blow through the condenser

I think you mean evaporator. This is what the fan blows through to produce the cold air. Being a conversion vehicle, there's no good factory reference information here to refer to. There must be a temperature blend door system in play, refrigerant state of charge plays a part, and proper system cycling to ensure the evaporator does not ice over is important. I would recommend seeking out a reputable local conversation company who can help work with the upfit manufacturer to diagnose an repair your concern.