The contact owns a 2018 BMW X3. The contact stated while driving approximately 55 MPH, the ‘Engine Coolant Level Low’ and ‘Engine Overheating’ warning lights illuminated. The contact drove the vehicle to an Auto Parts store and purchased a gallon of coolant. The contact refilled the coolant reservoir and became aware of a puddle of coolant underneath the vehicle. The contact drove the vehicle to a local dealer. The vehicle was not yet diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 71,000.