Air door actuator replaced with new One still will not work properly.

Did you replace the proper actuator -- the mode door actuator? If you're certain, then you may need to check to see if the air box mechanism is intact. It could be fractured, causing the motor's work to be ineffective. The circuit and climate control system should also be checked. I'd ensure, first, that the proper motor was replaced. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops