One problem related to engine overheat has been reported for the 2018 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Hyundai Elantra based on all problems reported for the 2018 Elantra.
I was driving on the highway at night when the "engine has overheated" warning came on, after which I managed to make it to a local road near before the car stalled. I had it towed to a Hyundai center the next day, where they told me I had a transmission fluid leak and they fixed the issue. Today, less than a week later, I was driving and about to go on the freeway when the "engine has overheated" warning came on again. I felt like it would be too dangerous to continue driving in case the car stalls again at night on a freeway, and am waiting on a response from Hyundai to either fix or replace the car.