GonzoUSN

Good Afternoon: Trying to help out a neighbor whose husband is on deployment. Their 2011 Journey is losing coolant but there's no visible leaking. Pressure test coming back good. Radiator fins not blocked and cooling fan comes on. She's been adding coolant to the vehicle every five or six days. She's using the universal coolant from one of the box auto parts stores. What else should we be looking at?