FORD EXPEDITION VENT NO AIR

I Have No Air From Front Vents. Back Works Fine, But Zero From Front.

Randomly I Get Little Air Flow Out Of Any Vents In The Front. The Blower Motor Is Running, And The Air Flow Is Loud But No Too Little Air...

Hot Air Is Blowing From Rear Vents But Only Room Temp Air Is Blowing From Front Dash Vents. What Would Cause This?

I Recently Replaced A Bad Blower Motor And After Replacing It No Air Is Blowing Through The Vents Any Reason Why? Yes The Blower Is...