88 chevy s10 4x4 front axle wont engage?

Question:
blazer,4.3L,auto,130K,transfer case engages front driveshaft,vaccum actuator under hood works,but vaccum is present in 2WD or4WD,makes no difference if plunger on actuator is in or out,no front axle lock

Answers:

Check engine light "on" -vs- "flashing" what's the difference?

Since S-10 blazers never had locking / unlocking hubs, I would take a closer look at that plunger / actuator. Sometimes the plunger breaks inside the front diff.

On a gm pickup the brake peddle to the Flore. put new master cylinder on?

If that isn't broken, and it still won't engage, it may have damaged splines inside the diff. , preventing the syncro from sliding into the locked position.

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Can We Combine TURBOCHARGER and SUPERCHARGER with FREEWHEEL COUPLING GEAR TRANSMISSION?

Does it have manual hub locks on the wheels?

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