I replaced all of my vacuum lines under my hood. However, I can't find where it goes into the cabin so that i can replace that line as well. I want to replace it because I have the issue where air always comes out of all of my vents. I also can't find the one that goes to the vacuum box. My vacuum lines were pretty hacked up by the previous owner. I have a 2000 4x4 blazer with a 4.3 and automatic.

 

Vacuum line for the cabin goes into the vacuum reservoir located in the drivers side fender close to the firewall. Just a short hose but can be a b*** to replace.
BTW, I'm just the other side of Gettysburg in Fairfield work in Hanover...

 

I am in Glen Rock. I am about half an hour from Hanover.

 

The rubber vacuum line for the HVAC runs forward along the left inner fender. Usually, just forward of the EBCM, it changes to a black plastic line that enters a wire harness, and goes back into the cabin.

 

Thank you Captain! That is exactly what I was looking for. Mine looks nothing like that.