My 2014 Dodge Journey began overheating. I relaced the water housing/thermostat and it was running great. Now 2 weeks later same thing happened. This time I took it to the shop, the inspected and said it was the thermostat. I said I just changed it and they said it may have been faulty. So I replaced it again. It was running fine and now began overheating. All symptoms the same. Now I have flushed the cooling system thinking maybe there was a blockage. It's still overheating. Do I need to replace it a 3rd time now the system has been flushed? Any ideas what might be going on? This time the coolant was very low before I flushed it. Please help.