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Cab retaining water, common problem areas?

baglie1
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baglie1 Enthusiast

baglie1

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I have a 2012 GMC Sierra 1500 Crew Cab 4WD and a few severe storms recently passed through with very heavy rainfall and winds. Now, when I drive, I heard fluid/water sloshing around!!! The bed is dry :-(. Are the 3rd Brake Lights an issue with these trucks? I've only had the vehicle for a few months and have barely driven, so I'm still not that familiar lol. In my mind the obvious are the rear windshield and the 3rd brake light gasket...

richard wysong Senior Enthusiast

richard wysong

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Posted

You are probably hearing water in the doors, make sure the drain holes are clear

  • 5 weeks later...
nitrozamboni New Member

nitrozamboni

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Posted

It’s probably water in the doors. Mine had tape over the drain holes! Poked them open and that took care of it. Now I’m waiting for the rust to come through!🤬

Z45 Senior Enthusiast

Z45

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Posted

Dirt settles in the door drain holes and traps water....lower corners of inside door skin.  

Homer1959 Enthusiast

Homer1959

Posted
Posted
On 6/12/2026 at 8:51 PM, baglie1 said:

I have a 2012 GMC Sierra 1500 Crew Cab 4WD and a few severe storms recently passed through with very heavy rainfall and winds. Now, when I drive, I heard fluid/water sloshing around!!! The bed is dry :-(. Are the 3rd Brake Lights an issue with these trucks? I've only had the vehicle for a few months and have barely driven, so I'm still not that familiar lol. In my mind the obvious are the rear windshield and the 3rd brake light gasket...

Thanks for not getting back to share your findings...  🙄

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