When i engage the 4x4 switch, it lights up, but it isn,t really in 4x4. i can hear the transfer case shift motor engaging and the vaccuum parts under the hood stay sucked in all the time, i know its only suppose to be sucked in when its in 4x4. can it still be the transfer case motor?
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It could be the switch, a fuse, a relay, the motor that engages the transfer case (very common problem) or the transfer case itself. Disconnect the motor arm from the transfer case and see if you can move the shift rod by hand. If you can then you know the transfer case is probably OK and you can test from the motor back to the switch.
If you hear the click in the floorboard then the problem is either the vacuum switch on the top of the transfer case, the vacuum actuator under the battery tray or the cable from the actuator to the front differential lockout. Changing all three will cost less than a hundred bucks if you shop around for the parts. The vacuum switch is the part where the three hose bundle attaches on top of the transfer case. The actuator will pull the cable when engaged, you will feel it pull when you engage the 4wd. It will move slowly. The other thing to check is the vacuum hoses between the source on the back of the motor, the hose from the switch to the actuator and the vent attached to the trans dipstick. If the vent is clogged it won't engage or disengage. Good luck
Check the fuse to the 4x4, if the fuse is good then check the 4x4
electric motor actuator on the transfer case. You should hear it work
from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if
you don't hear it working then check the wire harness at the actuator
motor, look for any damages like corrosion or cracked wire connector
clips. If the 4x4 actuator is working on the transfer case, then the
front hub 4x4 actuator may have gone bad and that's located on the
front differential. It's common for the clip there to corrode and break
and is an easy fix with a new collar pin, at worst it's the diaphragm
on the vacuum actuator that is located under the battery tray. There is
a vacuum switch on the top of the transfer case, driver side but when
that fails, your front hub stay's locked in the on position. Good luck
and keep me posted and hope it's a simple fuse that has gone bad. You
can pick up all these parts at Auto Zone or Parts Source and they will
have the step by step instructions for you to get the job done with
4x4 actuator may be bad. its has an elctrical switch. this is the part that pushes your front drive shaft forword to engage the front diff. it also may not be aligned properly. You should also check your transfer case fluid level and the front diffs fluid.
i have a 1993 blazer 4.3 w code 4x4 with a 4L60 E . my truck wouldn;t go in 4 hi or low. so i changed the transfer case motor and it works fine now. If you turn the ignition key to on but not crank the engine and open the driver door and push 4 hi button, you should hear the transfer case motor cycle for 3 or 4 seconds every time you push button and the light will flash until it goes in 4wd If the 4 hi button light doesn't flash during cycle then it could be a bad switch. if the transfer case motor won't cycle it could be a fuse or a bad transfer case motor . Hope this answers your question. pgale89