What's the 2009 Dodge Journey 3.5 Thermostat location?

The 2009 Dodge Journey 3.5 thermostat is located inside the coolant line connecting the water pump to the radiator. The function of the thermostat is to allow the car achieve the optimum running temperature in the shortest time possible. It does so by staying closed and blocking coolant flow to the radiator, letting the engine warm-up faster. Once the engine hits the optimum running temperature, the thermostat opens up, allowing coolant into the radiator, where it can cool off and keep the car from overheating and maintaining the temperature. If the thermostat is stuck open or stays closed, it will cause the car to run cold and overheat respectively. So, in any case, You should get it replaced as soon as possible.