Why do passenger vents not blow air on my 2000 F150?

I have 2000 ford f150 single cab and the a/c vents on the passenger practically don't blow air. You could literally barely feel any coming out while the two vents on the drivers side seem to blow as normal. I don't know if the vents are maybe clogged or if there's an electrical issue or something else. I just need some direction as to where and what to look for or a good diagnostic. I hope y'all can help because this texas heat is no joke.

Did you open the vents to full capacity? Move the little dial next to the vent.

Sounds like a broken blend door actuator.