# Mystery antifreeze leak

**URL:** <https://community.cartalk.com/t/mystery-antifreeze-leak/23011>\
**Category:** Maintenance/Repairs\
**Tags:** regency, oldsmobile\
**Created:** [December 6, 2008, 1:48am UTC](https://community.cartalk.com/t/mystery-antifreeze-leak/23011 "2008-12-06T01:48:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![namburn](https://avatars.discourse-cdn.com/v4/letter/n/a8b319/32.png) [@namburn](https://community.cartalk.com/u/namburn)\
**Post date:** [December 6, 2008, 1:48am UTC](https://community.cartalk.com/t/mystery-antifreeze-leak/23011/1 "2008-12-06T01:48:48Z")

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My 1997 Olds Regency occasionally leaks antifreeze, usually after I run the heater on the way home from work. I park it and then see antifreeze dripping from underneath the hood,passenger side, midway to the front. The mystery is my repair guy pressured up the system and could not make it leak! Any ideas where it is coming from?

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**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\
**Post date:** [December 6, 2008, 1:59am UTC](https://community.cartalk.com/t/mystery-antifreeze-leak/23011/2 "2008-12-06T01:59:25Z")

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If its the 3800 engine, it could be the intake manifold. they are prone to cracking.

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**Author:** ![namburn](https://avatars.discourse-cdn.com/v4/letter/n/a8b319/32.png) [@namburn](https://community.cartalk.com/u/namburn)\
**Post date:** [March 24, 2009, 3:59pm UTC](https://community.cartalk.com/t/mystery-antifreeze-leak/23011/3 "2009-03-24T15:59:18Z")

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You win the prize. It finally started leaking big time and I had to replace the water pump AND the plastic intake manifold.

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**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\
**Post date:** [March 25, 2009, 1:41am UTC](https://community.cartalk.com/t/mystery-antifreeze-leak/23011/4 "2009-03-25T01:41:59Z")

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And the problem probably stemmed from DEXCOOL coolant.

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**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\
**Post date:** [March 25, 2009, 2:19am UTC](https://community.cartalk.com/t/mystery-antifreeze-leak/23011/5 "2009-03-25T02:19:27Z")

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no cigar for you.

The gasket collapses around the bolts, the bolts become loose thus allowing air to mix with the Dexcool and mix with the engine oil.