Update:I've checked the Vacuum from the Actuator(lower the battery tray)to the T located near the drivers side firewall.the other hose from the T is connecting behind the plenum,aside the power brake hose.

The actuator is connected into the front Diff.

I need help please.Its supose to drain over 35mm's of snow today,I have kids to drive around and I really need the 4 weels to work.I surfed the web for over 3 hours yesterday night to try and find the Vacuum locations...no luck.

 

Dont bother answering.I found the solution.
I had a garage replace my t-case seals and when he puted it back,the Vacuum got stuck bettwen the case and the tranny.I could hear the air commin out under the truck from the hose.
Plus the valve is leaking,wich he did not boder telling me,and O ya,the Gasket from the case to tranny is leaking.I paid to have New gasket replaced! this is why I do not like to have other pleople repare my rig!
That is all and thanks!

 

Wow... Sounds like some pretty shoty work.. I have to agree with you on not having other people work on my vehicles. I only do it if I simply do not have the time. It got more difficult when I sold my Bonneville as I no longer have a 2nd vehicle to drive.

 

For future reference, there is a thread in the Self Help section on 4x4 not working. I am pretty sure I explain the vacuum lines in pretty good detail.
https://blazerforum.com/m_52228/tm.htm

Next time, you might want to search the "Do-It-Yourself" section (self help).