My a/c won't change from regular vents to floor vents?

Basically, the blower is stuck on regular vents. I can change the temp, but that's about it. When I press the floor vent or defrost buttons, nothing changes. I have a 2006 4cy Honda Accord for the record. I'll take any help I can get.

Must be something broken

There are 2 different sets of controls for the Accord. 1 manual set, which uses wires to pull doors open and closed, or vacuum switches and an automated system, that is electronic / computer controlled. Both are similar, to operate, but different in function, under the covers of the dash. Your system is likely the automated system, but you'll have to open the dash and pop out the switches to find out for certain. Often, you need to replace the main control unit. Heat, Condensation and time are often major causes of the switch faults. Your Honda dealer can quickly diagnose and fix/replace the part in an hour or two tops.

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