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:dunno:should vacum always pass through that or only in 4X4
 

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no, vacuum should only pass through when you switch into 4x4..there are two vacuum lines going it that solinoid, a red one and a black one..the red lower line is vacuum into the solinoid and the black upper line is vacuum out into the hubs..so when its not switched into 4x4 it should seal off vacuum allowing it to other components and when 4x4 is engaged it opens sharing vacuum with the front hubs ..i had a similar problem my vents stuck on defrost and my hubs wouldnt engage and my vacuum pump would run non stop and i discoverd my solinoid wasnt sealing off when not in 4x4. a good way to test quick is to turn the key to run (dont start, 4x4 off) and the pump should kick on and run for less then a minute and then should shut off automatically.. if it doesnt stop pull off the two lines into the solinoid and plug the lower red line and test again..if the pump then stops, its your solinoid..if it still doesnt stop with the red line plugged, start tracing lines!
 
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