Question about 2000 GMC New Sierra 1500

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I have a 1994 GMC Sierra 1500 that has a repeated clapping noise under the pasenger side dash. This clapping happens when the key is first turned on and when the engine is shut off. It appears to be the heating and air directional flap. What would cause this?

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I would check for CAT problem the material inside when is to old comes off en then is a big ball inside the CAT converter and when you start the vehicle the pressure push it agains the back end like trying to come out and when you shut it off release that pressure and then make it fall down on the bottom of you cat converter

Posted on Sep 24, 2009

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Posted on Jan 02, 2017

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