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Old 07-19-2011, 09:13 AM
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94 Vacuum line question

The 4x4 light is always on in my dash, and when investigating things that may or may not be the cause of that I came across a post that talked about the vacuum lines attaching to the front axle. These are on the passenger side of the axle and there are two lines. (I hope that's enough of a description so you know what I'm talking about.) from what I gather in two wheel drive the driver side line should have vacuum, and in four wheel drive the passenger one should have vacuum. If both are always have vacuum then there is a switch that needs to be replaced. (If I am wrong feel free to correct me)

My problem however, is that no matter what I am in (2H 4H 4L) I am only getting vacuum from the driver side line.

It also appears that there may be a small rust hole at the base of the post that the passenger line attaches to, so I imagine that piece needs to be replaced, but that doesn't explain why I am not getting vacuum to the line that connects to it.

Any help is very appreciated.
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Old 07-19-2011, 10:26 AM   #2
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This is a VERY common problem on these Jeeps. The best possible solution is to replace the vacuum system with a cable operated system. If you chose to stay with the vacuum system, I would suggest replacing all vacuum lines in the system. Over time they rot and leak. Any small leak will render you unable to use the 4X4 system.

4x4 Posi-Lok Positive Axle Engagement System for Jeeps

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Old 07-19-2011, 11:52 AM   #3
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There's a switch screwed into the top of the transfer case that switches the vacuum to those lines. It's common for it to get stuck then you have constant vacuum on one of the lines. I replaced mine last winter, cost like $15 for a replacement Transfer case switch at Autozone.
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