The contact owns a 2017 Ford Escape. The contact stated while driving at an undisclosed speed, the heater became inoperable. There were no warning lights illuminated. The vehicle was taken to the local dealer, who determined that coolant needed to be added to the coolant reservoir. The vehicle was repaired; however, the failure recurred. The contact stated that the heater then became inoperable. The vehicle was taken back to the same local dealer, where it was diagnosed that there was coolant inside the engine. The vehicle was not repaired. The vehicle was taken to an independent mechanic who replaced the engine. The manufacturer was not contacted. The failure mileage was approximately 64,000.