Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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There is a known issue with the type of water leak you are describing on your 2009 which is cause by a hole in the seam sealer at the roof panel to upper "A" pillar post. Gm has released a service bulletin dealing with this leak and the repair needed to get it resolved. I have enclosed the bulletin in the link below for your review. Have a look at it as I suspect it very likely applies to the leak you are having.https://dl.dropboxusercontent.com/u/104923897/Water%20intrusion%20Jan%202.pdf