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Hey all - new member here. Picked up a '15 suburban LS from a mechanic about 4 weeks ago. Though I bought a solid truck. 4 days after I brought it home the transmission started acting up. Replaced it. Then my wife found water in the drivers seat footwell after a rain storm. We thought maybe it was a fluke. Had a torrential downpour and lots of water in the footwell. So I read about the shark fin issue. Pulled the headliner down - sure enough the bolt wasn't even finger tight. I cleaned everything up and applied urethane sealant around the gaskets. Then I got the hose out and was baffled when water ran down the A pillar airbag. So I started pulling trim off the top of the truck. I found a small "pucker" or void in the roof panel seal. I cleaned it out and poured some water into it and it ran straight into the truck and down the headliner to the A pillar. So I cleaned that out and applied urethane there too. Took the hose to the truck for a good 5 minutes. No water. Strange factory flaw. Figured I'd share since I know water issues are a big complaint. If the sharkfin fix, sunroof drain fixes, and others haven't worked for you - check your roof panel seals. For urethane I recommend Sikaflex, or Lexel, or even some of the Henkel roofing stuff. Silicone is fine - but it doesn't stick very well unless everything is perfect, and I don't like solving the same problem twice. Cheers!

Hey all - new member here. Picked up a '15 suburban LS from a mechanic about 4 weeks ago. Though I bought a solid truck. 4 days after I brought it home the transmission started acting up. Replaced it. Then my wife found water in the drivers seat footwell after a rain storm. We thought maybe it was a fluke. Had a torrential downpour and lots of water in the footwell. So I read about the shark fin issue. Pulled the headliner down - sure enough the bolt wasn't even finger tight. I cleaned everything up and applied urethane sealant around the gaskets. Then I got the hose out and was baffled when water ran down the A pillar airbag. So I started pulling trim off the top of the truck. I found a small "pucker" or void in the roof panel seal. I cleaned it out and poured some water into it and it ran straight into the truck and down the headliner to the A pillar. So I cleaned that out and applied urethane there too. Took the hose to the truck for a good 5 minutes. No water. Strange factory flaw. Figured I'd share since I know water issues are a big complaint. If the sharkfin fix, sunroof drain fixes, and others haven't worked for you - check your roof panel seals. For urethane I recommend Sikaflex, or Lexel, or even some of the Henkel roofing stuff. Silicone is fine - but it doesn't stick very well unless everything is perfect, and I don't like solving the same problem twice. Cheers!