Yep. Drivers side vent, linked to back of t-case and ran up to engine compartment to vent. Middle to back of engine for vacume. Passenger side to accumulater for front diff under battery.
on the top of the transmission its on the transfer case with 3 vacuum lines coming out of it.
If equipped, it is on the top of the transfer case and has four vacuum lines plugged into it.
on top of the transfer case. You should see 4 vacuum lines going to the top of the switch
both, front engages by vacuum, transfer case is electronicaly shifted
diagram from front vacuum motor to transfer case of 1993 Jeep Wrangler
On a Dodge truck, the vacuum switch is on the transfer case.On a Dodge truck, the vacuum switch is on the transfer case.
If the button is not working, might be a vacuum line problem. Vacuum lines engage the 4x4, might need to check the lines to the 4x4 transfer case.
to me it and i just went through this its most likely a problem with the front wheels actuator either its faulty or one of the vacuum lines has a break in it. Vacuum pulls the front end into gear and and if its not getting enough vacuum it will not do it. also if there is transmission fluid in the actuator or vacuum lines you may have a problem with the transfer case switch where the vacuum lines come out of the transfer case sometimes the seal goes and will put trans fluid in the lines. replace the actuator blow out the vacuum lines if trans fluid is visible in the actuator and all should be good. but if there is trans fluid in the actuator and lines also check the level of fluid in the transfer case if you take out the top bung on the transfer case and oil runs out of it and i mean more than an ounce or two if its like a litre or more then you have a seal gone between the transfer case and the transmission which will pump your transfer case full of trans oil that also needs to be replaced. if so whoever is doing it for you tell them that there is room enough for 2 seals to be put in and the seals will never give you another problem. go through these steps and all should be fine. hope this helps if this works and it should please recommend me in this forum. thanks.
Although you have a manual shift on the transfer case the hubs lock in on vacuum. Chances are you have bad vacuum lines going to the hubs (about $150+ at a Kia dealer or $40 at your local service station). If not the lines, it will be the seals in the hubs.
This is a stupid system, but heres how it works. Electronic control on dash engages motor in transfer case to engage vacuum sensor on the transfer case, completes vacuum circuit from engine to vacuum operated shift cable under battery tray, cable pulls shift fork inside front diff half shaft, which engages passenger front axle. Very common problem with these is that the vacuum actuator on the transfer case gets stuck, so vacuum is constantly applied to the shift cable actuator, causing it to be in 4x4 all the time. Under the battery tray is the vacuum actuator for the cable, see if it has vacuum when 4x4 is supposed to be off, if so you will have to replace the sensor on the transfer case (not an easy task), or disconnect the vacuum line to the cable actuator to release the shift fork and prevent further damage. Hope this helps, Justin
The vacuum switch is on the top of the transfer case. The 4wd indicator switch is on the front axle shift actuator.
Check the transfer case switch on top of the case the one with the vacuum lines remove and check the roller ball if it dosent roll good replace switch cheapist thing to start with beside modules or a case