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Re: 95 Blazer 4WD problems
On the transfer case there is a vacuum switch with 3 vacuum lines connected to it.
One line runs to the actuator under the battery. If you put vacuum to it, it should operate the actuator and hold vacuum.
The second line is a vent to atmosphere with a filter on the end. Usually it runs up the transmission dipstick tube and is wire tied to it close to the top. That line should be clear and should not hold vacuum.
The third line should have manifold vacuum when the engine is at idle. It runs to a vacuum reservoir. On your 95 there is a black plastic ball mounted to the hood. There is most likely a vacuum tee and a smaller line that runs to the HVAC system, and then to manifold vacuum. If you pull the line off of the intake manifold, the line should hold vacuum.
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You have to know how it works,
to figure out why it doesn't.
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