Top vents not working

'03 TB LT
Manual Climate control is messed up. Suddenly the top vents will not blow air. The air just blows out of the bottom vents whether I select top, bottom, or blend. Defrost sill works. Any suggestions on where to start would be appreciated since I'm just out of warrantee with 37K on the clock :uhoh: .

This 3 year/36K warantee was well planned, this truck is starting to show some quirks. I've already had it in under warantee for left turn signal turning on the hazards, the factory alarm could be disabled using the door controls, throttle position needed to be reprogrammed, rear taillight boards had to be replaced...oh I'm tired to typing :evillol:

Sounds like a bad electronic blend door actuator. I think most of them can be reached from behind the glovebox door.

G/luck
Joel

Thanks for the advice. I can't believe it would go bad already. I have to get a price on one of these things. I may attempt to appeal to a dealership to "extend"y warrantee and fix it, but I won't get my hopes up.