Ok sorry for the delay, was busy. On my 05 there were two actuators. One a mode actuator, which is on the drivers sides, and the other, on the passenger side next to the glove department. Watch out in that the actuators look the same but they are not. On the Rock Auto site it’s hard to differentiate them. The blend door actuator is really cheap like $20 but the mode actuator is higher like $80. I dont have pictures so bear with me since this is from memory. The mode door is just that, it separates heat, cooling and I think fresh air modes so forces air to go to their respective coils. The blend acutuator simply blends air to the various spots like the defrost, floor, vent etc.
Ok the mode actuator is above the gas pedal and is held on by two or three 5.5 mm screws. I won’t go into the removal process since it’s been documented other places. Normally this is all y ou have to do. There is a shaft the actuator connects to but you should not not to time that. However me being stupid removed the piece the actuator connects to. That is held on by 3-4 of the same type of screws. I removed that and it then show three levers that actuate various doors. You can move them by hand just to see them move. Be careful they do interfere with each other and you will see what I mean. Now look at the piece you just took off and you will see the piece has three tracks each of the door levers slip into.j. It’s kinda a round looking track. The key here is you have to make sure they are in time so they don’t interfere with each other. It’s just a fidly process. Just do some trial and error trying to slip that piece in. Once you do that, quickly put a screw in! Wallah then put the mode actuator on and connect it. Before you button things up try it out and watch the actuator move things. If it does not then you have something binding.
Also if you want to do this, before you put that piece back in that controls the doors, start the car, let it warm up, and move each door buy hand. See if the heat comes out. Well assume you have it on heat. If you can’t feel hot air then you have a coil issue.
For others that are reading this, running coolant flush or simply flushing the engine likely won’t undo a clog in the heater core. It can clean the engine, and the radiator, but unless you disconnect the hoses to the heater core and do them separately I think the heater core will remain plugged. Good luck and I hope this makes sense. The site won’t let me upload pictures
