Trunk leak 2011 Regal

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I have a 2011 cxl and this fall the trunk keeps leaking. I took it to a mechanic and they can’t find an issue with the seals. Is there another issue with leaking?
 

Frayles

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I have a 2011 cxl and this fall the trunk keeps leaking. I took it to a mechanic and they can’t find an issue with the seals. Is there another issue with leaking?
I had a similar issue on my 2014 Regal. The culprit was a bad o-ring (smaller than a dime) seal where my passenger tail light seating peg rested in the rear quarter panel near the trunk opening. It had disintegrated enough to where the draining rain water would flow into the rear quarter panel and pool under the spare tire in the trunk. Hope this helps.
 
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