May i suggest ..
Pull out your lower glove box, in fact, pull the top box also
Now, just to the left of the Blower Fan, you will see the BLEND Door Actuator, it has 2 screws & electric connector.
Step #1 , Before you do anything else, play with the HVAC Controls, fan on Low & any other control, ie: Cold/Hot, as you watch the Actuator, you should see an Rod & a White lever moving.
That shows IF the actuator is working.
Step #2
Move the Temperature control, so that the WHITE Lever is in the down position, its not necessary, just makes reassembly easier.
Then Remove the 2 screws , let the actuator hang there.
Now grab the metal rod or the White Lever & move it left & right with 2 fingers, you don't need force.
You will be feeling for friction or weight,
If you do feel the friction or weight, then move it slightly harder & you should hear a THUD as the BLEND Door opens & closes.
That same method can be used on any of the 4 actuators
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Now if you removed the lower & upper glove compartments, look up, you will see the Recirculation Door & Actuator.
You can use the Recirculation button to watch that door open & close.
If you can Not, go to Step #1 & #2
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Behind the Radio Bezel, there are 2 more actuators, almost side by side. They are the MODE Doors, #1 & #2
They direct where the hot or cold air blows
Defrost, Feet, Dash & some Dodge Rams of the 2009 - 2012 years have a VENT that blows air flow to the back of the center console, so that the passengers get air.
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real good video
Quick video on replacing the driver's side blend door actuator. If your heat is cold on the driver's side but hot on the passenger's side, this might be your...
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you will not have the glove box cord