2010 dodge journey with 3.5 had heads, water pump, thermostat, replaced 5 months ago and is now overheating again. The Fan does kick into high as the temp advances. Have found pressure leak in the wall of the overflow reservoir. Used the bag over the overflow tube test to test for head seal leak and there was no significant inflation of the bag after driving a mile or so. Realize gases could be exiting the tank leak instead. Question is: will a pressure leak in the wall of the reservoir cause it to over heat and expel coolant by it's self?
