The heater/vent system will not blow warm/hot air even when dialed to 90 degrees on climate control

On a newer truck such as yours, the problem is usually the blend door actuator. First try a recalibrations of the system. Remove the HVAC fuse for a couple minutes and then put it back in. Start the truck and let it idle for a few minutes. Check to see if that fixed it.
If not, next check the actuator. I will paste instructions below for taking it out. Once you have it out, plug the connector back in and see if it turns when you change the temperature control. If not, the problem can be in the controller or the actuator. If it is clicking, the problem is stripped gears. If it isn't doing anything, you can check for voltage at the connector with a voltmeter. Connect the black meter lead to a good ground point and probe the connector terminals with the red lead while changing the temperature setting. The part costs $140, so do what you can to make sure it's bad before putting a new one in. Also, it may be worth your time to read my post at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air for other ideas. Please let me know if you have questions.

1. Remove the floor air outlet duct extension (1) from the floor duct (2).
   

Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)

2. Disconnect the electrical connection at the blend door actuator (10).
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Fig. Blend door actuator and related components

3. Remove the blend door actuator mounting screws from the HVAC module.

4. Remove the blend door actuator athe heater/vent system will not blow warm/hot air - 8a083a6.gifly with the actuator cam.


Fig. Remove the blend door actuator mounting screws from the HVAC module