Question about 1992 Chevrolet S-10 Blazer

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I have a 1992 blazer and the 4 wheel drive doesnt work, what are some thing s that would make this happen? but my transfer case is funtioning. because the front drive shaft will spin but the axel isnt locking in.

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Most common problem we see with the s-10 is there is a vacuum actuator under the battery box this is what engages the front definitional there is a vacuum switch in the top of the transfer case when you move the shifter into 4wd there is a lever inside the transfer case that pushes on the tor on the bottom of the vacuum switch witch allow es vacuum to flow to the front engage actuator under the battery box. so with all this said, check to make sure their is no vacuum leak form the back of the intake manifold to the switch and from the switch to the actuator, if their is no vacuum leak , and when the shifter is in 4wd and their is vacuum to the actuator then replace the actuator or cable if no vacuum to actuator then replace the switch on top of the transfer case.

best guess is you have a vacuum leak to the switch, the vacuum hoses run close to the exhaust manifold and if they come out of there bracket they will touch the manifold and get burned into.

Posted on Mar 24, 2011

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1 Answer

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1 Answer

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