Two things:
First, when I turn my truck on and turn the defrost on or switch from vents to defrost there is a noise that sounds kind of like a knock. Happens when I first crank her up and/or after she's all warmed up 🥺
Second, I get no heat blowin at my feet. Almost seems like I feel a draft down there sometimes. Blows out the vents and defrost fine.
First problem worries me a little more. Anybody else ever had this problem/sound??

 

Sounds like a blend door actuator gear is possibly slipping a bit. You may also have a blend door issue for the no floor heat issue as well.

 

What's the best way to fix that blend door? Be nice to have warm feet!

 

On my 04 ram there are 5 blend doors, I pulled my dash and changed all of them as its a common issue ,,there are some videos on how to do this just google it ,, , its sounds harder than it is of course you will need to disconnect the ac lines is the big thing but I know how to recharge my own system and while you have it out change the heater core