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Re: 1995 GMC Jimmy 4wd not working.
It has a lever to engage 4wd. No push button. I've inspected the vacuum hose. It all seems in good shape. I didn't know about the reservoir, so I need to check the part of the vacuum line under the firewall, but what I can easily see from it looks good.
Could the vacuum switch valve be bad? Is it on the transfer case?
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