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Chevy Blazer

Your 2002 Chevy blazer will switch to 4 low but wont go to 4 high?

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Wiki User
October 25, 2009 10:53AM

Check your buttons. You can pull out the button module from the dash. Then separate the back from the front. Use a q tip with alcohol to clean the points of contact between the buttons and the electronic board. This is an easy process and it worked for me. The connections tend to get oxidized.