Help with '96 Bronco?

[Lucky]

A/C? Yes. Will check hoses.
Previous says it was flushed one year ago but not driven since summer.
No thermometer.
Blender/ door stuck, maybe.
COcz: my Explorer, too. The actuator went. Helpful reading, thanks.
Otterbatcat: floor vents slightly warm, consistently.

Three hours into driving yesterday all temp settings kicked in, worked one hour, went out again (except floor) for 45 min then worked again remainder of trip. On, off, on again without me touching anything, so maybe not actuator or stuck door. (?)

mb504: PM inbound. Makes sense to start there, as I'd rather know if core is actually plugged before removing glove box. Might as well figure it out before it goes out again or winter turns quick.
SideShowBob: I hope not!
We'll see.

[SideShow Bob]

SideShowBob: I hope not!
We'll see.

Had two Ford trucks at work do this, both times it was pens down the defrost vents. Supervisor was pissed.