# Transmission pump

**URL:** <https://community.cartalk.com/t/transmission-pump/16659>\
**Category:** Maintenance/Repairs\
**Tags:** pump, transmissions\
**Created:** [July 13, 2008, 10:21pm UTC](https://community.cartalk.com/t/transmission-pump/16659 "2008-07-13T22:21:59Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Poochy](https://avatars.discourse-cdn.com/v4/letter/p/74df32/32.png) [@Poochy](https://community.cartalk.com/u/Poochy)\
**Post date:** [July 13, 2008, 10:21pm UTC](https://community.cartalk.com/t/transmission-pump/16659/1 "2008-07-13T22:21:59Z")

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I have a 2005 trailblazer leaking fluid out the vent. Could the pump be going bad?

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**Author:** ![pleasedodgevan](https://avatars.discourse-cdn.com/v4/letter/p/51bf81/32.png) [@pleasedodgevan](https://community.cartalk.com/u/pleasedodgevan)\
**Post date:** [July 14, 2008, 4:32am UTC](https://community.cartalk.com/t/transmission-pump/16659/2 "2008-07-14T04:32:17Z")

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I wouldn’t bet on that.

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**Author:** ![transman618](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/transman618/32/24_2.png) [@transman618](https://community.cartalk.com/u/transman618)\
**Post date:** [July 14, 2008, 2:55pm UTC](https://community.cartalk.com/t/transmission-pump/16659/3 "2008-07-14T14:55:43Z")

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Probably not. The venting could be from overfilling or coolant mixing with the ATF. How does the fluid level condition look?? Do you tow with it??

transman

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**Author:** ![Poochy](https://avatars.discourse-cdn.com/v4/letter/p/74df32/32.png) [@Poochy](https://community.cartalk.com/u/Poochy)\
**Post date:** [July 15, 2008, 2:41am UTC](https://community.cartalk.com/t/transmission-pump/16659/4 "2008-07-15T02:41:39Z")

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The dealer said that my transmission fluid was over filled and that it needed to be flushed and filled to the correct level. I have never had my ATF changed so I did not understand how it could be over filled, but I went ahead and had them change the fluid. It still is leaking but the level does not seem to be dropping and yes, I tow a trailer a lot. The dealer said that if the flush did not correct the problem then it is probably the pump.

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**Author:** ![Poochy](https://avatars.discourse-cdn.com/v4/letter/p/74df32/32.png) [@Poochy](https://community.cartalk.com/u/Poochy)\
**Post date:** [July 15, 2008, 3:02am UTC](https://community.cartalk.com/t/transmission-pump/16659/5 "2008-07-15T03:02:51Z")

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The leak I speak of is small, probably the size of a quarter when I let it sit over night. It has 50,000 miles and the ATF looks clear with a red tint to it, but again I just had it changed.