We have a 2018 CX-9 Signature with about 78k miles on the clock. My wife was taking the vehicle through the car wash on her way home from work, and the coolant temp light started flashing briefly. After she exited the car wash, it stopped, so she drove home. When she got home, the radiator fan was running on full blast (strange for an 85 degree day), and the temperature was on the 3/4 mark. I shut down the car and let it cool off, and discovered it was completely out of coolant. We had not experienced any noticeable coolant leaks before this. I had it towed to the dealer and it is being diagnosed. I'm hoping it's not the dreaded cracked cylinder head issue.