Vac tubes for vacuum disco

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10-18-2009, 11:09 PM

geeknik

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Vac tubes for vacuum disco

Does anyone know where this blue tube goes? These photos are on the passenger side in the engine compartment by the firewall. These are the same colored tubes that connect to the vacuum disconnect and also on the transfer case. Thanx in advance.

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10-18-2009, 11:22 PM

mike albo

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If memory serves I think that is a one way vent

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10-18-2009, 11:24 PM

89Laredo

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It is a vent for the front diff, The round thing on the end is a one way check valve..

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10-18-2009, 11:26 PM

geeknik

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So it doesnt connect to anything?

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10-18-2009, 11:26 PM

mike albo

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No you diff vent is buy your brake booster,it will have a white cap on it.

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10-18-2009, 11:28 PM

mike albo

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Quote:

Originally Posted by geeknik

So it doesnt connect to anything?

Its connected to your TC to engade the front axle when you put it in 4X4

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10-18-2009, 11:28 PM

geeknik

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Ok then so does this end of the blue line connect to anything?

Last edited by geeknik; 10-18-2009 at 11:30 PM.

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10-18-2009, 11:30 PM

mike albo

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10-18-2009, 11:34 PM

geeknik

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Dang. Ok. Thank you. Do you have any ideas then why my 4WD wont work? I have an NP231 transfer case. When I move the lever to go into 4 hi/lo I get nothing, nothing engaging, no front wheels grabbing. Any ideas?

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10-19-2009, 12:53 AM

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geeknik

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anyone.......well it is almost 11pm

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10-19-2009, 11:33 AM

#11

4.3L XJ

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I take it you have jacked up one front wheel and checked to make sure the light bulb isn't out. Generally, the culprit is the vacuum diaphragm on the axle disconnect. They are replaceable or you can opt for a more expensive cable operated disconnect. Another option is to take it apart and put some washers in so that it is connected all the time.