# Does a leaking heater core leak on the inside or outside?

**URL:** <https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138>\
**Category:** Maintenance/Repairs\
**Tags:** ford, taurus\
**Created:** [July 19, 2010, 9:23pm UTC](https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138 "2010-07-19T21:23:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![russharv63](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@russharv63](https://community.cartalk.com/u/russharv63)\
**Post date:** [July 19, 2010, 9:23pm UTC](https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138/1 "2010-07-19T21:23:07Z")

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If you have a leaking heater core in your car will it leak on the inside, outside, or both? Which one is more common?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [July 19, 2010, 9:24pm UTC](https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138/2 "2010-07-19T21:24:30Z")

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Inside.

Tester

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**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\
**Post date:** [July 19, 2010, 9:33pm UTC](https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138/3 "2010-07-19T21:33:56Z")

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Most late models do leak into the floor. Some trucks and several older models leaked out the AC condensation drain. If the core bursts under pressure the coolant can blow out everywhere at once.

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**Author:** ![Docnick](https://avatars.discourse-cdn.com/v4/letter/d/ecae2f/32.png) [@Docnick](https://community.cartalk.com/u/Docnick)\
**Post date:** [July 19, 2010, 11:07pm UTC](https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138/4 "2010-07-19T23:07:39Z")

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Agree; on my Mercury Comet at speed, the stuf came out of the defroster ducts as well as spilling on the floor; a REAL MESS.

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [July 19, 2010, 11:17pm UTC](https://community.cartalk.com/t/does-a-leaking-heater-core-leak-on-the-inside-or-outside/52138/5 "2010-07-19T23:17:43Z")

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I LOVE the smell of coolant-soaked carpet in the morning…