Why is my AC only blowing out of my defrost vents? Why is my heater not workin?

There are electric motors that meter between hot and cold air, as well as the mode of where the air blows out of. Testing will need to be performed to see if there is a problem with the controls or the motor(s). As far as no heat, this could be temperature control as well, or a problem with heat from the engine itself. This really needs to be evaluated in person by someone with experience and skill so that you can get to the bottom of your problem quickly and easily - it will not be a difficult diagnostic process for someone that know how to test this system. https://repairpal.com/repair-shops/ford-repair-and-service-in-houston-texas