How do you change Kia Rio block heater?

To change the block heater in a Kia Rio, first ensure the engine is cool and disconnect the battery. Locate the existing block heater, typically found near the engine's oil pan, and unplug the electrical connector. Remove the old block heater using a wrench, apply thread sealant to the new heater's threads, and install it in the same position. Finally, reconnect the electrical connector and the battery.