One problem related to engine overheat has been reported for the 2015 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Hyundai Sonata based on all problems reported for the 2015 Sonata.
Air intake was replaced 3x. 3rd time lead to turbo failure. Thompson Hyundai replaces turbo but doesn't put antifreeze, tighten oil screw (which blew oil all over engine), and they didn't even test drive it. Drove vehicle, smoke starts pouring from the vents, engine overheats. Vehicle gets towed back to dealership. Currently vehicle has check engine light on, rough idle and doesn't accelerate. Almost got into an accident because loss of acceleration. Also, the sunroof winddeflector which was recalled is now coming off again. Dealership used a small amount of glue to adhesive it back to the car. The glue has failed. Hyundai needs better service techs. They have destroyed my car.