Could I plug heater hoses?

[Konstantin]

Hello, I have 2008 Volvo with Cummins ISX CM 870. Today one of the hoses that goes from engine to heater elements in truck and sleeper developed a huge leak. As an emergency repair I just plugged both inlet and outlet hoses from engine to heater. Now I wonder is it a proper way? Maybe coolant has to circulate through inlet and outlet connectors from the engine? Before that truck I had older Volvo with N14 motor, so there was a shut off valve to stop hot coolant going into heater(which I used to use during summer). But maybe I couldn't do it with ISX. What would you say? Thanks!