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Message: <blockquote data-quote="Georged1" data-source="post: 16113" data-attributes="member: 1825">I had a 2010 with the same thing, wet floor when it rained     . Had it at the GM dealership twice to no avail. Got it line and searched and finally found the same problem and the fix...I purchase a tube of GE 100% silicone, opened the hood and between the driver side strut tower and the firewall is where my leak was.  I was able to pump enough silicone in that area to seal and stop the leak. You could remove plastic trim below the windshield for better access. Good luck George</blockquote>