The contact owns a 2018 Ford Escape. The contact stated that while the vehicle was being serviced at the dealer, the contact was informed that there was coolant intrusion into the cylinder and spark plugs. There was no warning light illuminated. The dealer related the failure to Ford Campaign Number: 21N12. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHSTA Hotline for assistance. The failure mileage was 87,119.