# 2011 Buick LaCrosse - Water on floor

**URL:** <https://community.cartalk.com/t/2011-buick-lacrosse-water-on-floor/187705>\
**Category:** Maintenance/Repairs\
**Tags:** buick\
**Created:** [December 1, 2022, 11:58pm UTC](https://community.cartalk.com/t/2011-buick-lacrosse-water-on-floor/187705 "2022-12-01T23:58:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Larry02](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Larry02](https://community.cartalk.com/u/Larry02)\
**Post date:** [December 1, 2022, 11:58pm UTC](https://community.cartalk.com/t/2011-buick-lacrosse-water-on-floor/187705/1 "2022-12-01T23:58:04Z")

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water leak on rear passenger floor

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [December 2, 2022, 12:27am UTC](https://community.cartalk.com/t/2011-buick-lacrosse-water-on-floor/187705/2 "2022-12-02T00:27:46Z")

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this video is for a 2010 but yours should be the same. seems it happened to others that the drain comes out. there might be a drain hose on both sides ot the trunk so check for it.

[2010 Buick Lacrosse sunroof drain - YouTube](https://www.youtube.com/watch?v=V0x12mJoIEw)

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [December 2, 2022, 9:49pm UTC](https://community.cartalk.com/t/2011-buick-lacrosse-water-on-floor/187705/3 "2022-12-02T21:49:09Z")

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Another possibility is the rear door drains are clogged. Windows that open & close do not seal 100%, so rain water always gets past the seal & inside the door. No worries, inside of door is water resistance, and any water that gets in has a designed-in pathway to just drain out the bottom of the door and outside. If drain holes are clogged, water may drain into car instead. Open rear door, use a mirror to inspect door underside. You should see a bevy of small drains holes. Make sure they are open.

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**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\
**Post date:** [December 3, 2022, 2:12pm UTC](https://community.cartalk.com/t/2011-buick-lacrosse-water-on-floor/187705/5 "2022-12-03T14:12:21Z")

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> [@David-John](#):
>
> If you’ve noticed wet carpeting that’s only on the front passenger’s side, it may be that **the heater core is leaking**.

The very brief post says water on _rear passenger side_ .

They did not ask for help so this is just another of those complaint posts .