2014 Ford F150 air not blowing at all

Hello, You likely have a bad blower motor, blower motor relay (if equipped), or a bad blower motor resistor. Normally the resistor only functions for fan speed 1-4, so fan speed 5 works when the resistor fails, but that is not always the case. You should have a relay under the hood for the blower motor. If everything else seems functional, check for power at the fan in speed 5 before deciding it is the blower fan/motor.