Heat blows from dash vents only not floor or defroster

Heat blows from dash vents only not floor or defroster I have a 2007 Dodge Grand Caravan. The dash vents are the only vents that work. It blows hot air so I don't think there is anything wrong with they heating system. There is just no air from floor vents or defroster. Years ago this was controlled by vaccum lines, but now everything is electronic. Any ideas?
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bert [Entry]

I also have a 2007 Dodge Grand Caravan and ony the air centre vents were working. I tried disconnecting the negative lead for 10 minutes, and while it was disconnected I cleaned the lead so there would be a good connection. I reconnected the lead and everything was working again. I love going to the internet for my automobile solutions it has saved me lots of time and money.