Due to all of the brand new technology and systems in these cars and they tiny EV volume Kia sells, dealer technicians are really inexperienced in diagnosing and repairing these cars. Their only option is to refer to the handful of procedures that Kia Corp has provided to them. Any issues that don't fall within those procedures have to be documented at the dealership, communicated to Kia HQ, and resolution is then lead by the EV engineering team in Korea. Replacement driveline, battery and electronics parts aren't stored on site at dealerships, they have to be sent from Korea.
Fanbanlo - it's possible that resolution of your issue might be as easy as swapping the battery fan. But if this is the first this particular fault has surfaced, the issue will be thoroughly investigated and documented in tandem between your dealership and the EV team in Korea (many timezones away, so little overlap in their shifts for direct communication) which slows down the completion of such a repair.
Kia Soul EV+, Porsche 928