Back again with another problem! I have a 2006 Mazda 6 3.0, got coolant leaking from somewhere but don't know where. I've replaced the water pump "whole assembly", Thermostat and o ring, bypass hose and a set of new spring clamps, coolant T, ECT sensor! Now what I suspect the problem to be is, the water outlet that contains ECT sensor! Any ideas, or anyone had any weird leak story maybe I can relate to my situation?