Cooperman, it's done just shy of 43k. The more I'm looking into it, in convinced it's coolant related. I initially had heat from the air vents, which disappeared due to the lack of water. I didn't check the water level before I started my short journey of a 15 mile round trip, but had only done about 400 miles since it's service in August.. Could the water really have depleted that much in this time, assuming the expansion tank cap was screwed on correctly? Could there be any failed sensor that would allow the cooling system not operated properly, to then overheat and cause a leak?