No matter what position I turn the dial to select the vents it blows out the defrost vents. What should I look at?

The climate system defaults to defrost if there is a vacuum leak.
If you've done any recent work under the hood or dash check to see if you didn't accidentally disconnect a hose.

Yes I just finished replacing the VP44 today. Where is this vacuum hose?

The lines at the firewall beside the brake booster are usually the problem.....

http://www.dieseltruckresource.com/pics/data/500/PICT0282.JPG

That first line on the left was disconnected down at the bottom. It's working now. Thanks for your help!