NHTSA Complaint #11512418 — 2021 FORD F-150

The Cabin recirculation button turns off by it self, lets air in from outside.. ie. smoke, car and truck exhaust.. cold air. this has been going on since I owned the truck and Ford says it is designed to do that.. window anti fog design.. I will get in my truck in the morning and turn heat on to take chill off... low air speed and 2 clicks past half way on the heat and it will only stay on for 1 -5 min and turn off on its own. I drive 1 hour to work on interstate and everytime it turns off I smell exhaust from semi's and other cars around me in traffic. so I have to keep turning it on to keep from getting choked out by the smells from traffic. Ford says no way to turn off.. This is a design flaw.. I know of no other car manufacture that does this.. I have videos of it turning off..