I own a 97 chevy s10. My 4wd is not engaging and was told at first I need a vacuum activated switch then after asking if the vacuum hub lock switch was right one I was told to find a front differential switch which confused me even more. Which switch needs replaced correct name and how tos would be appreciated.
Well if it is the vacuum actuator then, i'll explain how to fix it. But first it is a vacuum controlled diaphram that is located under your battery. All you do is take your battery out, you'll need a 5/16 wrench or and 8mm to disconnect the battery connections. Then get yourself a 3/8s drive wratchet and a 8 inch extension,a 1/2 deep well socket to take the battery hold down off, which is directly down from your battery on the side faceing your window. Then after your batterry is out there is a pan that your battery was sitting on now use your 1/2 socket and your wratchet and take that pan out. then you will see this round black thing with 3 6mm bolts holding it on take that out and disconnect the cable going into it is just a little clip holding that on. Then disconnect the vacuum hose going to that it just pulls off. then take that to your junkyard and ask for a new one or go to a parts store if you have any more questions just ask
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There are 2 models here the push button will flash if the system is not engaging or disengaging properly . If front drive shaft is turning. That is with car raised and supported . if front drive axles do not turn then the axle actuator is not engaging axle shaft passenger side. Remove actuator and manually engage shifting collar with a screwdriver still does not turn then inner axle is twisted.
Make sure that the vacuum hose connector is connected AND connected correctly at the transfer case and at the front differential. If that is all right and the front differential still doesn't engage, then you need to test the vacuum actuator at the front differential.
Sorry no idea here without as look to see whats wrong ,could very well be a electric solonoid switch that locks up a dog clutch but 4x4 is not something i do very often .Most i see are permanant 4x4 isnt this truck permanant rear wheel drive anyway and you lock in the front diff by means of a solonoid or a cable
This is a common issue with the Jimmy's in that year. Because you can hear the shift motor it likely works. The
problem is likely at the front differential. There is a vacuum actuator
that has a cable that pulls on a lever which engages a clutch inside the differential tube.
vacuum originates at the engine, goes to the transfer case. On the
transfer case the is a vacuum switch which then directs the vacuum to
the vacuum motor when 4x4 is called for. You will need to check for
vacuum at this motor which is located on the right front engine
compartment down low. Tricky to get to but not impossible. Follow the
cable from the right side of the differential if you can't locate it.
If no vacuum, trace it back to the leak. If no leak, the vacuum switch on the transfer case may be bad. If vacuum is there, which I suspect it is, replace the vacuum motor and cable assembly. There you are, if you have further questions, please ask me here.
Check the actuator under the battery. make sure that it's working and pulling on the cable to lock the front hub. If it is and the front wheels are not locking then the clip at the front pumpkin (differential) may be broken or the fork that engages the axle. If everything looks good and the actuator is not working, inspect the vacuum line to the 4wd vacuum switch on top of the transfer case (drivers side) and then work your way to the vacuum line to the engine compartment. There is a T vacuum line by the ABS unit on the drivers side and inspect the lines there and the vacuum canister in the fender. Good luck and keep me posted and hope it's a simple vacuum line that went bad and not the front pumpkin.
there is a vacuum actuator under the battery tray. it is the most common cause for this issue. also the cable that goes from that actuator to the differential stretches sometimes causing it to engage and not engage depending on how bad it is.