The air ducts on my 94 Z28 will not switch, and air only comes out of the top vent. I found the Schematic on Shoebox's TECH page, but I can't print all of it out, so I can see what's happening. How can I print the whole page out instead of just the top section. If anyone has any ideas about what might be the problem,, I would appreciate any help.

 

I finally was able to print out the Schematic, but it's hard to determine what the problem. I'm thinking that a vacuum line may be off.