Performance Ford Lincoln Bountiful

New 2015 F-150: When heater is on, the defroster and side vents also come on full strength with very little air flow to floor heater. Defroster and side vents won't turn off making the upper cabin excessively hot and the floor and feet remain freezing cold. The Service Dept people were amazing, super helpful, did everything by the book, replaced the actuator motor door etc. But the "Ford recommended fix" did not fix the problem. Floor and feet stay cold, have to drive with windows down in winter to sweep the hot air from upper cabin area. Very uncomfortable. I do ot recommend 2015 F-150's to anyone living in cold climates. My F-350's heater works beautifully. Hope Ford finds a fix for the F-150 before next winter or will trade it in for a Chevy.