If it were me I’d call http://deadjeep.com/… or http://daveysjeeps.com/… its not in production anymore and the only place you’ll problem find one is salvage… don’t give up, I found one on eBay when it broke on my 97 a couple years ago…
I just did this. I bought a used on off eBay but it looks like Summit and others have them. This runs from the drivers side of the engine, to a T into the cabin (where it actuates the hvac internal louvers to direct air) and then down to a small black box below the battery mounted on the fender. That box is called a vacuum reservoir. Someone helped me on this not long ago. You can patch the line if you just have a break. Most auto parts stores sell coupling kits and line. It's akin to fixing PVC pipe.
I carry heat shrink on the trail with epoxy...also a way to temporarily fix a vacuum line. But I'd do as suggested above and buy some hose and Ts and couplers.
AC. When I have the fan direction set to the vents and get on the throttle the air diverts to the floor and defrost. When I let off the throttle the air then blows back thru the vents as it should. Seems to be a vac line so I was inspecting the line and ended up cracking the brittle line myself.
So you have leaks and possibly a check valve issue. You can fix the small lines using 3/32” vacuum hose to repair the brittle parts. If it is damages at the firewall some times you can pull it out with a pair of needle nose plyers, if you cannot access it I use a antenna or welding rod and push a piece of vacuum hose through the grommet and connect it behind the glove box. I will spray the line with carb or brake cleaner and push the rubber hose on this will glue it enough to hold. Here is a quick diagram of how it should be set up. Here is a search of what you can find to make your own. You can use just rubber vacuum hose. Manufactures use the plastic because it is cheap.
I just did this. I bought a used on off eBay but it looks like Summit and others have them. This runs from the drivers side of the engine, to a T into the cabin (where it actuates the hvac internal louvers to direct air) and then down to a small black box below the battery mounted on the fender. That box is called a vacuum reservoir. Someone helped me on this not long ago. You can patch the line if you just have a break. Most auto parts stores sell coupling kits and line. It's akin to fixing PVC pipe.
I carry heat shrink on the trail with epoxy...also a way to temporarily fix a vacuum line. But I'd do as suggested above and buy some hose and Ts and couplers.
I carry some vacuum tees in my spare box, I also carry air line coupler for my locker. If I replace a line I try to make it a little long so I can cut the end if needed down the line. I have found vacuum hoses usually fail at the ends. If you carry one of these tees and a straight coupler you can cut them to the size hose you need. https://www.summitracing.com/parts/...MIk8yLjOfEgAMVxRGtBh2wxwFpEAQYDCABEgLT4fD_BwE