A good possibility, though a possible major PITA, is that the inside / outside air linkage is not working. Search here for air filter replacement issues. My '13 made me restart climate control for a while until I saw other examples of it here. Even opened a case with a super helpful Toyota engineer...he ended up not finding the cause, but comp'd me a free month on TIS.
Back on topic...forcing the inside vent air baffle open to change cabin air filter screws a complex linkage up big time. I was lucky, I was able to reset the baffle with a firm push. Otoh, if the linkage is broken, you've got some major disassembly ahead. Based on pics here, I leave the cerveza until after I was done.
Good luck
Steve