Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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sense the switch light does flash,i would think the problem is still at the encoder actuator,,it is very common to get a bad new encoder motor for these.
remove the encoder and use a crescent wrench to manually shift the transfer case back and forth a few times,sometimes the case can stick and be really hard to shift from a lack of use,,
then re-install the encoder motor,
again if this encoder motor doesnt have enough power to shift the case,i would think you will need another encoder actuator
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i would think you will need to repace that encoder...it is common to get a bad new one
the transfer cvacuum swictch is mouted on top of the transfer case,it has 3 vacuum lines that go to it
the vacuum comes from the intake to the switch,it 4wd,it sends the vacuum though a hose to the vacuum actuator under the battery that pulls a cable that engages the front differential..the other line on the switch is just a vent.
the switch only operates the front,has nothing to do with the case
do not operate the motor without it being mounted to the transfer case.
just because the case motor moves if not mounted,does not mean it has enough power to shift the case