I have a broken vacuum line on the top port of the actuator switch. I believe this line goes to the front axle but I CANNOT find it. I want to replace the hose so I can hopefully get the 4wd working again before snow starts falling. Any advice/ diagrams on this type of 4wd? I could not find much on the forum for this type of 4wd. 2001 Blazer.

 

Your lucky My hose broke at the same place and when I tried to get the little part off the switch it I broke the stem off requiring a new switch...only about 60 bucks at the dealer. If you can pull the hose to see if you have enough to go over the stem once you have gotten the little piece of the hose off the switch (If your lucky) if not enough go down to auto zone etc and some more hose (That's cheap) and find something to put in between the old and new hose to let the vacuum thru and your done...easy fix providing you don't break the nipple off the switch...

 

That hose runs to the front axle engagement actuator located under the battery. As dman said, you can see if the hose will reach as it is. Just be careful when attempting to remove the piece still on the solenoid.

As far as diagrams go, check out the 4wd related threads in the tech article section. I created a vacuum diagram specific to the NV236 transfer case setup.

 

Thanks for confirming it goes straight to the actuator under battery tray. The hose kind of just disappears back there and I could not trace where it goes.

It's definitely not long enough to cut and stretch back on. I'll see if parts store has some kind of connector to new hose to avoid needing to replace the whole hose. I'd like to avoid removing that battery tray if possible.