Blend door heater blows cold air?

I would make sure the coolant level is full, (engine cold only). Even though you feel coolant (hot) the flow rate can be low because of a clogged heater core, you might want to remove the hoses and flush it using a garden hose. I don't think it is a blend door actuator because both sides (right and left) would need to be bad at the same time. This does have dual range climate control correct?

Here is a video to help

https://www.youtube.com/watch?v=SNRb6pSwYuU

Please upload a short video in your response of the problem, so I can see what's going on :)