Last year, early fall, my 2012 Focus SEL sat for 2 weeks. After driving car approximately 1 mile, coolant temp soared. Checked tank, bone dry. Added coolant, and car was fine until Sunday, March 15. Again, tank was dry with coolant dripping from under right headlight. I couldn't find any obvious locations of leak. I refilled tank, put an empty 1 gallon milk jug cut in half. In roughly 12 hours, again, tank dry. Was going to take car to dealer, filled the tank, and no leak. Car has been sitting for approximately 1.5 hours since filling tank and running engine to get it warm, and it's still full. I've read about the infamous thermostat housing issues. Is the housing in that area? Any ideas?