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I have a 2004 F150 XLT super crew cab. I bought this used with around 99,000 miles on it. There is a plastic / rubber two piece cowl panel between the hood and the windshield. There are little rubber type material tabs on the outer edge between the fender and the cowl panel. They are there on my truck but they have started to come off. I have noticed that when I get up to roughly 45MPH and over I get a flapping wind noise on the drivers side of the vehicle only. I thought it was that little rubber flap because it came off completely and the noise got a little worse. I super glued it back on but the noise is still the same. I am just trying to find out if anyone else has experienced this and know the fix for it. It is driving me nuts.
You can purchase new cowl ends at cowlends.com . Get the bundle (cowl ends and retainer clip) - $19.95. They may not stop the wind noise but they will keep the water out.
I have the same problem. Purchased the new cowl ends a couple of years ago, but nothing really changed. The noise in my truck seems to vary depending on wind direction and direction of travel. There will be times with no noise and other times with constant noise.
Hopefully, someone who has fixed the situation will chime in.