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I have a 2012 Acadia AWD that rattles @ 900 RPM and @ 2000 RPM. Two things that I have noticed are that it needs to warm up to get the rattle and if it is raining out the rattling is less. Anyone have a suggestion where this might be coming from?
 

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Have you driven it up on ramps, had someone run the RPM's in question and crawled around listening? Rap the exhaust to try and find it? Open the hood and have someone hit the gas pedal?
 

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... Anyone have a suggestion where this might be coming from?
I'd guess it's coming from somewhere between the front bumper and rear bumper.
 
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I have a 2012 Acadia AWD that rattles @ 900 RPM and @ 2000 RPM. Two things that I have noticed are that it needs to warm up to get the rattle and if it is raining out the rattling is less. Anyone have a suggestion where this might be coming from?
Ive been having this exact same issue. Went through the car wash then it went away for a little while. Did you ever figure out what it was?
 
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