2005- no air/heat from vents - only defrost & floor

[*EXPLORER CHIX*]

My air & heat has stopped blowing from my vents but still works fine from the floor and defrost. What can cause this and how can I fix it. If you have a diagram or picture of the fix, please attach that also.
I had the EGR replaced 4 days ago and this happened 2 days ago. Could they be related somehow?
THANKS!!!

 

[William McKenna]

Same happened to my 05 XLT. I fixed it in 20 seconds. Do you still need help? I have a few pics if you still need help.

 

[penske2584]

Curious of the solution

 

[grenz]

Same happened to my 05 XLT. I fixed it in 20 seconds. Do you still need help? I have a few pics if you still need help.

Can you help me fix this problem? You state that you fixed this problem in 20 seconds, can you tell me how you did it with pics and text.
grenz