A/C blows hot air passenger side and back seats

So I turn the air on and all blowers work in the front section and back sections (third row seating). The problem is front driver is cold air but passenger and back seats get hot air. I was able to remove the door actuator out on the passenger side and manually turn it but I still felt hot air. I probably will still replace it but haven't yet to see if that was the problem. What worries me that I read that manually doing it I should have felt a difference but did not. I live in Florida and summer is coming fast. Help!