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Re: 4wd system operation 98up Blazers
Can you post a picture of it? Starting in, (I think) '99 there is an electrical vacuum switch on the 4 button systems mounted on the firewall above the distributor but I don't believe it was used on '96, unless someone added it for some reason. There might have been a factory TSB for it, not 100% certain of it though. Trace the vacuum line from the transfer case switch... IIRC the vacuum line to the actuator runs along the passenger side to the actuator under the battery.
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You have to know how it works,
to figure out why it doesn't.
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