Question about 1989 Jeep Cherokee

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1989 Jeep Cherokee Pioneer 4wd problems

My 4wd doesn't work in any position. Could it be any part of the vaccum, if so can I have as many diagrams and directions possible?

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  • Brandon Bird Feb 01, 2009

    Not til next weekend, but I'm only gettin a little bit of suction out of the vac. hose at the front bumper.

  • Brandon Bird Feb 02, 2009

    Not yet because I have to go to school this week, but tommorow we hopefully will have a snow day

  • Richard Scordino May 11, 2010

    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?

  • Richard Scordino May 11, 2010

    Did you look under there and see if anything is disconnected? Diagram or not, thats where I'd start!!!

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Depending on what year, if its late 80's early 90's cherokees use both mechanical and vacum! check on the passenger side rear of the front axle housing there should be a vacum line there with 2-3 hoses that has a rubber gromet that slides on to the vacum line on the axle make sure it is connected, some times you need to put something to hold it on like some tape or apoxy until you can clean well and re attach correctly!

Posted on Feb 12, 2010

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Most Jeeps are mechanically shifted, not vaccum.

If it is mechanically shifted, simply check your linkage underneath.

That's after you check you front driveshaft and make sure it's working, and there. I've known people to steal em.

If it is vacuum operated, then I'm at a loss.

Posted on Feb 10, 2009

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