Question about 2004 Chevrolet TrailBlazer

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Hi 4th &5th fan speed heat ,cold not run - 2004 Chevrolet TrailBlazer

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I had the same problem with a 2005 trailblazer. the problem was in the connection at the blower motor. the wiring harness was loose and not making a good connection. this harness is kind of hard to reach. it is located on the passenger side all the way to the right and up behind the dash. what i did was take the harness loose, and replace the end of it then plug it back in and have had no problems with it since.

Posted on Jan 18, 2009

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