noticed this morning my defrost wasnt working, it will only blow on the main vent and floor vent, i can still switch between hot and cold that works fine but ive seen that theres possibly 2 things it could be. Is the air door actuator and blend door actuator the same thing?

 

What year you working on?

 

2016 f150 xlt 5.0 4x4

 

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got it added im in a 2016 F150 XLT

 

Does the heater work?
One very simple thing to check is to make sure your coolant is at the proper level in the expansion tank. If it has been very low, you may very well have air in the system that restricts the flow through the heater core. Report back.