Question about 1989 Jeep Cherokee

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4 wheel drive not engaging

I need vacuum diagram for 4 wheel drive 89 cherokee

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  • towjam41 Jan 25, 2009

    Can someone crawl under their 89 cherokee, and see where the 4 lines off the front axle go. And posable the one on the left goe's to a blue line off the passenger side of firewall?

  • Richard Scordino May 11, 2010

    If you need a diagram I don't have one but if you have a question about a line or two, I can likely tell you where they go.



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I do not have a vacuum diagram for the 89 Cherokee, but my 89 had the same issue several times and all it was is that the block of vacuum lines that go into the front axle on the rear of the axle on the passenger side of the vehicle. I ended up having to put a zip tie around the axle and hose block to hold it on. Have not had the issue again since doing this. Hope that helps.

Posted on Jan 25, 2009

  • Joshua Artman
    Joshua Artman Jan 27, 2009

    I was able to locate a Chilton and Haynes, but both of them just have the same vacuum diagram that is on AutoZone's Website:
    That diagram does not look like it will be much help in this case.

    I probably won't get a chance to get under my Cherokee until sometime next week.



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If I read this correctly ( which I might not have, bit early for me ), the front drive shaft will engage ( from the transfer case ) but the front wheels are not engaged ?

If so, sounds like either the vacuum from the IWE ( Integrated Wheel End ) is not being released, or the IWEs have had an issue with part vacuum ( damage vacuum lines ) and the IWE gear is rounded off.

If you pull the vacuum lines at the IWEs ( there are 2 lines, 1 is the vacuum line, the other is the vent tube that routes up into the engine compartment and is not attached to anything ), the front wheel should engage ( might need a 5 * turn to mesh the gears ). With the vacuum lines off, jack up the front axle ( take precautions, chock the rear wheels, parking brake, jack stands, etc ) see if the front wheels are engaged ( turning one wheel should turn the other ). The option is to do this after the truck has sat over night, and the vacuum has been released out of the vacuum reservoir.

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IF the front dive shaft does not turn, check that the vacuum shift motor on the front axle is operating.

Item #10 in the diagram below.

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Sounds like an issue with the IWE gear ( spring ) not engaging.

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Four wheel drive wont engage

Hi ninja,


Make sure you have plenty of 90 wt. in the front axle. I've got an '86 Cherokee Laredo. It doesn't kick right in to gear. You need to be moving, but not to fast. Sometimes reversing, then back into drive works.

When you disengage it, if you are moving at or above 30 mph, you'll hjear a rapid clicking from the front axle as it tries to let go. Put it in neutral for a second or two. That will take enough strain off the drive train to allow it to disengage.

Best regards

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It's unlikely a relay is producing your symptoms.

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If that clicking you are hearing gets more rapid as you increase speed, slows down when you do, then that's what it is.

A vacuum leak is the likely problem, easy to fix, difficult to find.
I have a Cherokee. I had the same problem. Start checking vacuum lines that lead under the engine to an actuator attached to the front axle.

Good luck,

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