A ford f 150 s blend door is the device that controls how much heat or ac comes through the hvac system.
Ford f150 blend door actuator fuse location.
Disconnect the electrical connection at the blend door actuator 10 in pic below.
I love my truck but i wish ford had fixed this problem by now.
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Remove the blend door actuator mounting screws from the hvac module.
There is also and air inlet door actuator which is mounted behind the glove box on the far right side.
Blend door actuator and related components.
Remove the blend door actuator as an assembly with the actuator cam.
For the last 20 or 30 years in these trucks they have been prone to failure.
Very common for that part to fail on your tru.
A failed heater blend door or actuator can cause the temperature control for the hvac system to stop working.
If you have dual temperature control ac there is another actuator on the bottom of the case.
The temperature blend door actuator which is located behind the radio on top of the evaporator case.
If the heater gets stuck on the hottest setting the heater blend door may be broken requiring replacement of the heater box to repair the issue.