Ford cannot determine where the coolant goes unless an owner takes it in. That is the purpose of the sensor, people are not checking the fluid levels. If you visit the NHTSA you will find 200 "investigations" on the Fiesta. Turns out any report starts an investigation with almost all dismissed as not reproducible. One call and you too can start an investigation. I read many and they were a joke. One had a stumble upon leaving a traffic light, the report said never happened again and they did not report it to Ford. But 4 months later file a complaint with NHTSA. As to the recall Ford has never said it is a head issue, always a coolant level problem. Anyone that knows engines will tell you when the coolant level in a car with aluminum head drops below the level of the head you can buy a new one. This happens only when in the ST the level is basically empty. If you don't check the fluids it is partially your fault. Too many people rely on a quickie oil change for their maintenance. Really? You go to a place based on how quick they can service your car, and you trust them to do it properly?