All air coming out defrost vents

[Bigdad]

Bought a '73 Convertible last July. Loving it so far but have a few issues i'm dealing with. Right now all the air comes out of the defroster vents, nothing from the floor vents or dash vents. I recently replaced the radio, could I have mistakenly knocked something loose when I had that taken out? It seemed to be working OK prior to me doing the radio replacement. Thanks

 

[Kilgon]

Here is a diagram of the vacuum lines and motors they go to. This is for an a/c car but it should work for you to figure out what came off.

 

[Hemikiller]

The vacuum driven AC system defaults to defrost when there is no vacuum in the system. I would start at the vacuum tank on the fender apron to ensure you have vacuum there, then check the connections inside the car.