Description And Operation: Description

WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.

ATF warmer is mounted on the valve body cover. It increases the temperature of cold ATF to reduce viscosity friction and improve fuel economy.
It rapidly increases the ATF temperature during initial engine operation stage.
It also prevents ATF from overheating while driving.

Courtesy of KIA MOTORS AMERICA, INC.