Question about 1994 Chevrolet S-10 Blazer

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Where is the 4 wheel actuator switch on a 96 S10 pickup it will not engage the light flashes then goes out

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There is a vacuum plunger that sticks and it is on the top of the transfer case above the front drive shaft.It has 3 vacuum lines going to it.The actuator itself is under the battery tray.You will have to remove the battery and battery tray to get to it.I would check the plunger first.Takes a 7/8 wrench.Just remove it and try to push in the metal plunger.It might be stuck in the in position already.If it is then it will not move.You should be able to push it in and out.If you can`t then replace it.Good luck.

Posted on Dec 10, 2009

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Posted on Jan 02, 2017

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I’m happy to assist further over the phone at https://www.6ya.com/expert/brock_d67526d2a834c47e

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My transfer case is permanently engaged but no 4 wheel drive...


2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.

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