blend air door

Overview: It's a 2002 Explorer I bought it about a month ago. There were two issues, which I believe are separate problems: (1) It only blew hot air, even when turned to cold, and even though it was only ~40' outside. (2) It would blow to the windshield or dash vents fine, but not to the floor...

We bought this Explorer new and it has been very well maintained. No accidents, no major problems. For the last three years the AC hasnt worked correctly, barely cooling a full refrigerant charge. The heat would only work when it wants to, and only if the temp is on 65, nothing else, it works...