blend door, etc.

I own a custom shop in Memphis where I have built a fully functional prortotype mold for a cool replacement complete dash and I am now piping it for A/C, heat, def. I need a schematic that shows the proper operation of the entire system so that my plenims are properly placed for air flow. I do not even know at this point if the truck has a properly working system, therefore I can not test it. PS the entire dash is out but I have the controller hooked up and have access to all blend doors.:screwy:

What year system?

It is a 1988 S10 Blazer

A old factory manual from e bay or sometimes public libary has car repair info.
AZ web site has some repair All Data info.
Most repair shops have repair programs on the computer that they can check and print out the info for you.

Or a All data online one year sub has the vacuum and electrical stuff in it.

http://www.alldata.com/products/diy/index.html

Alright, I had to leave the Blazer for a while and work on 7 other cars. Now I'm back, I got a print-out both from ALLDATA and GM. I now understand the function of the system ( 1987 S10 Blazer) but I have found that I have no vacuum supply anywhere I know to look. Being that I am a fabricator and not a mechanic I need a crash course in origination and path of vacuum. I do understand that there is a resonator there to store , boost and regulate the vacuum supply but I do not seem to have any going into the resonator. Help!!!