97 Astro blowing out of def and floor only

I wanted to know if anyone can help me find a vacuum line diagram for my 97 astro van. Please Help.

Most common problem is that the black plastic vacuum line is cracked. broken, or heat damaged- right where it passes in front of and slightly under the air intake on the engine upper intake manifold- - you may want to remove the air intake snorkel to see it better- no need fo a vacuum diagram- just follow the black plastic line from the conduit (near a/c accumulator- silver bottle) back to where it plugs in behind the a/c compressor- if it is like all the ones I have seen- the line will fall out of place because it is broken.....Repair by splicing in a rubber hose over both ends- no need for clamps- it is a vacuum