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Message: <blockquote data-quote="mars2878" data-source="post: 27594" data-attributes="member: 12483">Soo, on that drive to Tampa the Sierra drove great. But there was a weird slapping sound while on the highway. I've never heard this noise before from the truck. But I couldn't tell you the last time it was on the hwy.But the last time it was on a hwy, it didn't have the cap. Was the noise coming from the cap?I was confident that it was coming from the front, but where?My mom thought that it was coming from the roof.While driving, we are touching one interior panel at time to see if it changes pitch. Even pressed on the overhead console as ive previously done some plastic welding on it.Nope, nothing.It sounded like a cargo strap slapping a body panel.When I get out, I'm checking the windshield molding thinking that it somehow came loose. Nope, not that either.Ahh ha, found a potential noise maker. The driver side of the wiper cowl was loose. I pull the end cap off & find that the screw mount is broken along with the screw is missing. I also find that 2 clips on the fwd edge are missing.Someone has clearly been in here before.[ATTACH=full]5477[/ATTACH]Also, one mount is broken off of the driver side end cap.[ATTACH=full]5478[/ATTACH]And the rubber seal is damaged on the passenger side end cap.The 2000 cowl part # is: 15047072The 2002 cowl part # is: 15060065I did not notice any differences between the two parts.The 2000 L cowl end cap part # is: 15045455The 2003 L cowl end cap part # is:15045455Again, didn't notice any differences between them.The 2000 R cowl end cap part # is:15045456The 2003 R cowl end cap part # is:15113341 15753702Still no noticeable differences. But I know that the R cap is different between with & without a Fender mounted antenna. I currently don't remember the years that are involved?</blockquote>