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I have a 2004 Buick Rendezvous, loud noise when the engine is first shut off.

dward99dward99 Posts: 1
edited November 2015 in Buick
When you first shut it off the car makes a loud noise like feedback from a microphone. We've tried turning off all accessories like a/c, heat, lights, radio, Still does it what could it be?????
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