Blend door actuator on ford f150 need to change it think that's my problem why heater is warm and not hot

That is a hard one to call without seeing it in person. It could be a clog in the heater core (have you ever had it flushed?), a bad selector switch, or a bad blend actuator. I think the F150 of that year uses an electronic blend actuator similar to the one used in the Explorer (some of them are vacuum while some are electric), you'll have to look at the box to see why type it uses or if you can pull the panel off, check the back of the hot/cold switch. See if it has vacuum lines or an electrical connector. I know the Explorer has a fix kit because the electrical actuator will strip the gears and not change the door position easily or at all.

Could possibly be a vacuum leak. The blend door actuator controls are usually ran off of vacuum. It is possible that once the engine warms up, even though you have it to heat, the loss of vacuum will cause the blend door to switch positions.

if the heater hoses are both hot its a blend door actuator, and possably the blend door its self, the way to make sure is to feel around under the dash . feel the black hvac box and if its feels warm then the heater core is good, you will have to remove the dash to replaced the bland door actuator and blend door ,i reccomend you replace both beacause its alot of work to remove the dash so make sure both components are replaced while you are in there

if the heater hoses are hot the only thing it could be is a blend door, if you can hear the door moving its not closing all the way, those are made of plastic and are common to brake at the actuator you will hear the actuator work but it will only partially close and open the door

check to see if the blend door is moving where you change the temperature setting. I think your blend door is behind the glove box. Here are instructions for removing the actuator. Take it off, plug it back in and see if the motor rotates. Also check to see if you can rotate the blend door by hand. If you can rotate it by hand, the motor is probably broken of the gears are stripped. Let me know if you have questions.

1. Release the stops and lower the glove compartment door.
   
2. Disconnect the connector.

Fig. Blend door actuator-F-250 & 350

1. Remove the two screws. Rotate the blend door actuator and bracket assembly. Remove the electronic blend door actuator and bracket assembly.
2. To install, reverse the removal procedure.

both hoses is hot signifies thatcoolant circulation is just fine check the blend door actuator it might be stuck.pan the heater temp controller from hot to cold do you feel any change in temp of the air from the blower?if you dont feel any change check the blend door actuator

Alternative 1: Blend Door actuator problem

There is a TSB out on this problem. If the thermostat and everything else is good, you may have a problem with the Stratification (Secondary) Temperature Blend Door. This door is now available separately versus replacing the whole case assembly. The instrument panel needs to come off to gain access to it and this might be a job best done by a Ford Dealer.
If you think you might want to give it a shot yourself, you can get a copy of the TSB at the Ford Dealer. It is TSB number 02-23-6 dated 11/25/02. It has the repair procedure and a list of parts needed.

Alternative 2: Heater Core needs to be flushed

Check heater core hoses. If both are hot, not enough heat inside, suspect blend door actuator.
If one hose hot and the other warm or cold, the heater core need to be flushed (very common),

The AC/Heater blend door temperature control actuator electric motor is most likely defective, very common problem,

your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.