Year/Make/Model: 2015 Ford Fusion Engine Type: 1.5L EcoBoost 4-Cylinder Description of Safety Flaw and Incident: My vehicle is experiencing severe overheating and internal engine fluid loss due to the widely documented Ford EcoBoost coolant intrusion defect. The vehicle routinely runs hot, losing coolant rapidly with no external signs of a visible hose or radiator leak as well as failure of the brake lighting stop bumper and purge valve connecting to the gasline after fueling. This issue causes the vehicle to rapidly overheat while in motion, forcing sudden loss of engine power (limp mode) during highway driving. Car not properly cranking after fueling and brake light continuously being on even when brakes not being pressed. This unexpected drop in speed creates an immediate crash hazard for myself and surrounding traffic. Coolant entering the combustion chamber also fouls the spark plugs, causing severe engine stalling, rough idling, and misfires. I've spent several dollars fixing these malfunctions that have continuously persist. Ford Motor Company has historically been aware of this structural defect involving coolant leaking across the cylinder bore walls, yet failed to issue a comprehensive safety recall for 2015 models. I am filing this complaint to urge the NHTSA to open a formal defect investigation and mandate a safety recall, as this component failure leaves drivers stranded in hazardous traffic situations.