Question about 2004 GMC Safari

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I have 2004 GMC Safari Van. I am hearing a loud rattling noise under the van. someone is telling me that it is a heat shield and others are telling me that it's my catalytic converter going. I do I find out which one is causing this noise. Please help me. Thank you. Charlie

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If you drive on gravel roads it may be gravel inside the shell,covering the converter this is the heat shield,or it may be loose and vibrating.Check fot any of the exhaust grounding out against the frameworks. If you have or can barrow a rubber mallot use it to beat on the converter pipe close to the converter ,you may find the noise related problem,look for loose hangers or clamps.

Posted on Sep 13, 2010

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