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The 4WD version of the Trailblazer has a rotary switch to the right of the steering wheel. The positions are 2hi, AWD, 4hi, 4lo. There is a N light for neutral. Rotate the switch clockwise from 2hi to AWD to let the computer select when to provide power to the front wheels. Rotate from AWD to 4HI to have 4 wheel drive. Remember to refer to the Owners manual for the maximum speed that you can travel in 4HI and 4Lo, and also how fast you can be going when you switch between modes. To go back, just rotate the switch counter clockwise.

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Q: How do you switch to 4 wheel drive on a 2002 Chevy blazer?
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