Hi,
Rear auxiliary heat isn't offered on this vehicle. That is when you have a separate blower motor, heater core, and so on specific for the rear of the vehicle. Usually, they are found in vans and SUV vehicles.
As far as your vehicle is concerned, heat to the rear is provided via a plastic duct that runs under the center console. When you select heat to be directed to the floor, do you get it in the front? If you do, start by checking the floor duct adapter is still attached. It is held on by two nuts.
Take a look at pic 1 below and let me know what you find.
Take care,
Joe
See pic.
Image (Click to make bigger)
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Wednesday, December 15th, 2021 AT 7:00 PM