In this paper, a new modeling approach combining native Simcenter Amesim submodels and Modelica submodels is presented. FMI terminals are used to enable the physical connection of fluids between Simcenter Amesim and Modelica. The innovation lies in the fluid properties that are computed in the causal and acausal worlds using the same technology. The architecture of a new Modelica AmeTpfMedia library developed to ensure continuity of fluid properties is presented, along with its accuracy and performance. Using this new approach, a demonstrator of a closed-loop heterogeneous cooling system for battery thermal management is built, opening the door to a new way of thinking complex multi-physics systems.