July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Rear Heater Control Unit Replacement
WARNING: This page is about a different car, the 2007 Kia Sedona and 2006 Kia Sedona. However, it is still accessible from the selected car via links, so may be relevant.
Remove the rear heater control unit (A).
Disconnect the connector (B).
Fig 1: Identifying Rear Heater Control Unit And Connector