I have the same problem! 2013 200 limited 3.6L. I hear the water sound mentioned above and no heat to my passenger side. Occasionally, there’s no heat to the drivers side either. But never any to the passenger side. Air is blowing on both sides, the one never gets hot and the drivers side doesn’t get hot enough. Maybe it’s just too cold for the one side to keep up with, especially competing with the arctic blast coming from the other side. I do not have the dual climate system and There has not been any changes in the Car’s Running temperature. My A/C does not get cold either. But I believe that is a separate issue entirely. Has anyone narrowed down the heat issue or is there a good place to start?