How did this water get in?

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BillinNM

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Sweetwater, TX
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2018 Quadcab 4X2
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OK, so I have noticed after a decent rain -- which has been a scarce article in West Central Texas these past several months -- that the truck cab smelled a little musty. This afternoon, I got ready to run an errand and the smell was really strong, coming from the back seat of my 2018 4X2 crew cab work truck. We have had more than 4 1/2 inches orf rain in the past 48 hours, so if I had a leak somewhere, this would be a test. Sure enough, I pulled up the lower seat bench and there was a half-inch of water in each of the wells. It had been there long enough -- or the moisture had been consistent enough that some of the stuff I kept under seat -- a Tony Hillerman novel, ball caps, etc. were mildewed. The cork handle on my collapsible hiking staff had green mold on it. I was shocked. Trying to figure how it got in, I noticed the liner was damp going up the back of the seat. When I looked at the joint between cab and bed, I noticed some leaves had collected there so I swept them out -- and found five of these little rubber coverings among the debris. Can someone tell me what is going on here?. I have 78,000 mostly highway miles on my Ram and the sweet little Pentastar Six.
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CamperMike

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As Caulk04 says it's the vents on the back of the cab. Those rubber pieces are the flaps that are supposed to be protecting your cab from rain. I replaced those vents a couple years ago on my 2018.
 
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BillinNM

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Thanks guys. Here's a stupid question that I couldn't find an answer to in my owner's manual: How do you get the upright seat back to fold down -- and I assume this gives access to those vents?
 

NETim

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Thanks guys. Here's a stupid question that I couldn't find an answer to in my owner's manual: How do you get the upright seat back to fold down -- and I assume this gives access to those vents?
The seat backs do not fold down unless you do the seat mod. Otherwise, you have to pull the rear seat out to gain access to the vents.
 

GTyankee

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It takes a bit of work, but you need to pull the rear seat.
Use an Impact Wrench, air or electric, to make it easier.
Any Seat Belts that you unbolt, mark where they go, maybe even take a few pictures.

Original vents

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watch this video


While you have the rear seat out, consider doing the
Rear Seat Modification

or
 

caulk04

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Don't silicone the vents to the body. I didn't need to replace my vents, but they weren't sealing tight to the body. I cut a couple sections of a paint stirrer and put between the body and the retaining clips inside, forces them to seal more tightly. No more leak.
 
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