There is a clicking or knocking from behind the dash? Blend door actuator?

2012 CHEVROLET SILVERADO
95,000 MILES • 4.8L • V8 • 4WD • AUTOMATIC
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ART ROBITAILLE
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I'm getting the clicking sound, more like banging, but I read a motor replacement article that mentioned a plastic gear set that could be broken. How can I check this so that I don't replace the wrong part?
Jun 8, 2020 at 7:53 PM
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ASEMASTER6371
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Good morning,

There are several actuators. Do you know which one? Try changing modes or temperature and see if the noise changes. That will help narrow the one that is making noise. this guide can help and video can help.

https://youtu.be/Eqf-H3COtSo

and

https://www.2carpros.com/articles/replace-blend-door-motor


Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.
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Feb 12, 2021 at 1:37 PM
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ART ROBITAILLE
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I would have to say the first view. The sound is under the glove-box.
Feb 12, 2021 at 1:37 PM
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ASEMASTER6371
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With the noise happening, put your hand on it and see if you can feel the ticking.

That will confirm it.

Roy
Feb 12, 2021 at 1:37 PM