Hyundai Elantra overheating issue persists after thermostat replacement on Hyundai Elantra

Submitted by Vehicle Owner · Feb 20, 2026
Published by RepairPal

Problem overview

Some Hyundai Elantra owners report experiencing persistent overheating issues even after replacing the thermostat, which may be attributed to several factors. These include coolant leaks from the radiator, water pump, hoses, or other components that can lead to a loss of coolant. Additionally, improper bleeding of air in the cooling system can exacerbate overheating problems. Owners also note that a malfunctioning radiator fan may fail to provide adequate cooling, while a defective water pump can further contribute to the overheating issue. Furthermore, some owners have identified a broken serpentine belt as a potential cause of engine overheating. If these problems persist, it is crucial for owners to investigate these potential causes to effectively resolve the overheating concerns in their Hyundai Elantra.

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Hyundai Elantra vehicles with this problem

1 model year affected

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