Question about 1997 GMC Jimmy
There is a vacuum actuator under the battery it could be leaking vacuum. There is also an electric actuator on some models found in the same place. There is a cable that runs from the actuator to the front differential that locks it in. Make sure you have vacuum and the actuator is pulling the cable when 4x4 is engaged. hope this info helps.
Posted on Mar 24, 2010
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 common tools.
Posted on Dec 09, 2009
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Posted on Jan 02, 2017
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