If your Ford F-150 has heat on one side of the cab but not the other this is your problem. If the passengers don’t have heat it’s the blend door that’s the easiest to get to which is behind the radio. Couple of screws and you’re done. But like everyone else of course that’s not the one that breaks. So this is a solution to fix the blend door without paying $1000 at the dealership, removing the dash, disconnecting and re charging a/c lines. Etc.

Cost = $32.49 for Dorman or OE was $47