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Re: chevy s10 4 wheel drive will not engage
There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.
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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.
have the actuator (mounted on the drivers side transfer case) checked. that is what makes the selection from 2-4 hi-4 low. it takes the place of a gear shift. they are a fairly inexpensive and easy repair (if thats the problem). i would start there providing you have checked the fuses and relays. i hope this helps.
Make sure that the vacuum actuator for the 4 wheel drive located on the axle is getting vacuum when its being engaged. A vacuum pump can be used to test the actuator for leaks. If no vacuum check line for breaks and if no breaks that you have feed vacuum for the switch itself