Buick Park Avenue Vent Replace/Remove

My Air Just Goes To Window Not My Center Vent. I Will Start The Car And It Will Come Through The Center Vent But Then Go Back To The Defrost...

This Has Electronic Switches That Change The Vents That The Air Is Flowing From. It Will Only Switch From Defrost To The Floor Vents. It...

I'm Having Trouble Changing Or Getting The Vent, Defrost, Air Cond (max) Or Normal Ect. Buttons To Work, As To Change, Even To The Off...