I have a 96 blazer that the 4x4 doesnt work. does anybody have a vacuum diagram that i could possibly look at? for the front wheels, i see the cable that goes under the battery and i also see a vacuum line that goes no where. it was also a vacuum leak.i know the switch works and the prop shaft for the front works but no wheels turn. if anybody could help me, i appreciate it. thanks

 

Here ya go...check the resevior first On the underside or the hood right in front of the steering wheel.....the hose often comes off there and it won't work if it's disconnected......post up if you need more help.
EDIT dang it it didn't work! I'll keep trying.