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Username Post: 2012 Silverado 1500 WT Cab Odor
Senior Member
Posts 533
04-24-19 04:47 PM - Post#2764960    

I finally found the source of the damp musty odor that I got after every rain storm. I though it was coming from the AC but I was wrong. It was from the 3rd brake light. I removed it and took the gasket off the light, when I gave it a squeeze, water dripped out! This OEM gasket looks like it was shot in with a cocking gun. It didn't look like the typical rubber gasket that I expected. Of course Chevy doesn't offer just the gasket, they want you to buy the whole light assembly. I didn't bite, I put a thick bead of black RTV in the channel of the original "Gasket" then reinstalled. Then, just to be sure, I laid a bead around the entire light fixture. There is another way for water to get in the cab, check the weather stripping at the top of the door towards the back. There is a grommet that attaches the weatherstripping to the cab. Over time, they get loose and will allow water to get in. I peeled mine back, one side was loose, the other was pretty tight. I smeared some RTV on both sides just to be sure. It's been a couple of months and I can safely say that the moldy damp odor is gone for good!
"13th Year" Silver Supporting Member
Posts 9351
04-27-19 06:13 AM - Post#2765133    

82 Monte Carlo SC, 355 w/Vortec heads, roller rockers, 625 Demon Carb, TRUE DUALS.
2009 Sub.5.3L LTZ 30 Gallons of gas @ $2.28/gal. bla bla bla.

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