2007 3/4 ton Silverado (New body) Ext cab 8' bed 6.0 Vortec

So, I've had a bad smell coming from the truck since spring started (bought the truck in February) I've cleaned it top to bottom and couldn't get rid of it. Eventually noticed it only happens when it rains, and started looking around and found the padding under the floor is SOAKED. I have checked this from all easily accessable parts of the truck on all sides (Driver, Passenger, Front, And Back) Worst part is, it has rubber flooring (Which I hate) so it retains the water even better. I already have to go tear the inside of the truck apart and dry it out today, was wondering if anyone has suggestions on things to look at for leaks, and possible fixes to them.

Thanks
Nick

 

Nick,

Oh no! I am sorry to hear that you are experiencing an issue with water leaking into your vehicle. Please private message if i can be of any assistance.

Regards,

Jennifer T.
GM Customer Care

 

Hi Nick
My only suggestion... and it's basically what the technicians are gonna do.
Unbolt your seat and take it out. Remove your rubber mat and underlay (you need to hang it out to dry anyways.

Remove any passenger side interior plastic around the windows.
Now make yourself comfortable in the truck while you get someone to spray it with a garden hose.
This is the best way to find were your leak originates from.

Let us know how you do.

 

Honestly, if your truck showed up at my stall at work, what in2trux said is exactly what I would do. Get the rubber and underlay out and spray the heck out of the truck and see where it leaks.

 

Seen leaks at third brake light. Gasket of brake light housing to body.

 

If it is mainly on the right, I'd check the a/c condensation drain hose. I've seen those get blocked and dump water inside. On rainy days the humidity is higher, so it pulls a lot of water out of the air.

 

I bought a brand new 2008 gmc sierra 2500 that had the same issue. Brought it back to the dealer several times, no luck. Finally 8 years later I was wiring new exterior cab lights and had to pull the headliner down. In the process I noticed the tube which was supposed to drain water away from my sun roof was disconnected! This clearly happened at the factory! Once I reconnected it the water problem stopped. 8 years of a soaking wet drivers side floor! If you have a sun roof you might want to check it. Mine has been dry ever since.

 

My bet is that tail light gasket or a window. I had a leak in the trunk of my Grand Marquis that turned out to be the back window.

 

Try the rear brake light on the back of the cab for the bed