Defroster and Heat Controls Do Not Work?

What was the original issue? That you couldn't select hot/cold or that the air wasn't going from floor to dash to defrost? Your vehicle has only one electronic actuator that is used for recirculation. The temperature and mode dials use mechanical cables and not actuators to control the system. The common failure is the cable clips that hold the cables to the plastic housing. They are prone to cracking and then they fall off, usually they end up on the floor and go unnoticed.
To get to the mode control cable you have to remove the glove box and you can see the cable connection on the side of the case. To get to the opposite end you remove the center trim from the dash panel. To get to the temperature cable you remove the center trim panel from the dash and the control panel will tip down with it, the cables are 1 and 9 in the image. Either end can come free from the clips. To get the trim panel off, block the wheels, now inside use a trim tool (butterknife will work) to release the trim on the shifter, then remove the screws that hold the bezel to the console. I generally remove the trim, then shift into low and remove the screws. That way you don't need to bother removing the shift knob. With that out of the way you remove the upper trim panel then gently pry the center trim out of the way as well. You will see the cables and the way they run. Pick the one that is the problem and probably replace the clips on all of them while you are there. One thing I have done before to stop this is to drill a pair of holes through the plastic and use small zip ties to lock the cable housing in place with the clips. Sort of a belt and suspenders approach.
Once you see the way they are installed in person you will see why they fail. You should be able to get replacement clips through the dealer. Just be careful prying on the plastic, it gets brittle with age.

I would pull the trim and go look at the cables, It isn't hard to lock them in place once you see the clips used. They used to sell the repair clips, guess they didn't make enough on them. I think you have the part numbers reversed though.
Try going here https://www.moparpartsgiant.com/ and enter your VIN then try the two part numbers you have. I show these. However I would still go in first, you can buy zip ties for a lot less.

If the doors are operating with the cables the next step would be a power flush. For that you use a special flush gun with water and compressed air to knock the debris loose and flush out as much as possible. Unfortunately the core design in the newer vehicles uses a smaller tube design that plugs easier, the smaller tubes allows for a smaller core size, but also clogs faster. Normally what I do in these cases is to use clamps on the hoses going to the core to block them off. Then disconnect and use the flush with plain water both ways through the core a few times. Like this - https://www.youtube.com/watch?v=k3DtObGjoXM
Yes it's messy. But as Eric says, if you catch it in time it usually helps a lot.