# 2007 GMC 1500 water leak onto floorboard

**URL:** <https://community.cartalk.com/t/2007-gmc-1500-water-leak-onto-floorboard/132311>\
**Category:** Maintenance/Repairs\
**Tags:** sierra1500, gmc\
**Created:** [January 9, 2019, 6:06pm UTC](https://community.cartalk.com/t/2007-gmc-1500-water-leak-onto-floorboard/132311 "2019-01-09T18:06:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![MichaelDonald](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@MichaelDonald](https://community.cartalk.com/u/MichaelDonald)\
**Post date:** [January 9, 2019, 6:06pm UTC](https://community.cartalk.com/t/2007-gmc-1500-water-leak-onto-floorboard/132311/1 "2019-01-09T18:06:47Z")

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leak either from the windshield of front vents above the firewall. water leaks onto the floorboard under the carpet.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [January 9, 2019, 6:09pm UTC](https://community.cartalk.com/t/2007-gmc-1500-water-leak-onto-floorboard/132311/2 "2019-01-09T18:09:10Z")

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Possibly a plugged drain for the AC spilling into the truck. Check that first. If that doesn’t help, it may be the windsheild seal. A hose and a helper can help you find that.

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**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\
**Post date:** [January 9, 2019, 7:17pm UTC](https://community.cartalk.com/t/2007-gmc-1500-water-leak-onto-floorboard/132311/3 "2019-01-09T19:17:10Z")

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If that doesn’t help inspect in front of windshield outside for damaged or clutter in vents that let fresh air into vehicle.

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**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\
**Post date:** [January 9, 2019, 9:22pm UTC](https://community.cartalk.com/t/2007-gmc-1500-water-leak-onto-floorboard/132311/4 "2019-01-09T21:22:03Z")

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Not sure about GMC’s , but common on Fords

Did this leak start after replacing the bulbs in your center high mount brake light / bed cargo light ?

I know, you think I’m nuts, but the water can make it to the front.