For the last 20 or 30 years in these trucks they have been prone to failure.
Ford f150 blend door actuator fuse location.
Blend door actuator and related components.
The temperature blend door actuator which is located behind the radio on top of the evaporator case.
Remove the blend door actuator as an assembly with the actuator cam.
A ford f 150 s blend door is the device that controls how much heat or ac comes through the hvac system.
Disconnect the electrical connection at the blend door actuator 10 in pic below.
A failed heater blend door or actuator can cause the temperature control for the hvac system to stop working.
Remove the blend door actuator mounting screws from the hvac module.
I love my truck but i wish ford had fixed this problem by now.
There is also and air inlet door actuator which is mounted behind the glove box on the far right side.
If you have dual temperature control ac there is another actuator on the bottom of the case.
Get the f150 blend door actuator here https amzn to 2ka2wgy canadians get the blend door actuator here https amzn to 2zeneni if you have come to this vid.
Very common for that part to fail on your tru.
Heres a step by step how to video on a temperature blend door motor actuator video for you 2004 2010 ford f150.