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Just out the truck in neutral first. Engage the 4 wheel drive. You will hear this happening. Be sure to put it back in neutral to disengage the 4 wheel drive. First off are you sure it is not working?

Sometimes it is hard to tell, you may only feel a little resistance in the steering when when turning.

The four wheel drive transfer case is solenoid actuated so do some electrical detective work.

Is the switch working?

Is the fuse blown?

Is there power to the solenoid when the switch is on?

Have someone turn it on while you listen under the vehicle, does it click?

remove the solenoid and reconnect the wire connector and try it again, the solenoid should move and click.

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Q: Why won't the 4WD work in a 2002 Chevy Trailblazer?
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