Vacuum supply 4WD

[dardamar]

1996 Chevy Blazer LT. In the process of installing new engine and rebuilding the transmission. Its been awhile since I removed the engine, transfer case etc. so I dont clearly remember where the transfer case gets its vacuum from. I am talking about the series of hoses that go back to the transfer case. I can see where they hook to the transfer case but where does it get hooked to up in the engine compartment as the vacuum supply? This is a push button 4wd system.

Thanks.

[muddog321]

PVC supply off intake also has the vac over to the drivers side reservior where it Ts off to plastic heater control line and the transfer case supply.