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How do I replace a 1989 Jeep Cherokee water pump - diagrams with step by step would be helpful
Where does the vac line @ the front bumper go? Begin looking right on the front axle. there are several different designs that use a vacuum motor on the right side axle tube. You should be looking at vacuum lines that serve the 4x4 components not just any lines! Of course if any vacuum lines have developed leaks or have become disconnected it will lower overall vac to the entire system, but make sure the 4x4 system itself is hooked up before jumping all over the place! Of course, you have looked at the mechanical linkage to make sure the shift lever is actually moving the control on the transfer case, right?
Did you look under there and see if anything is disconnected? Diagram or not, thats where I'd start!!!