# What part is this? 1999 Mercedes Benz diesel

**URL:** <https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562>\
**Category:** Maintenance/Repairs\
**Tags:** mercedes-benz, e-class\
**Created:** [June 29, 2020, 6:30pm UTC](https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562 "2020-06-29T18:30:15Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Honda98](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@Honda98](https://community.cartalk.com/u/Honda98)\
**Post date:** [June 29, 2020, 6:30pm UTC](https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562/1 "2020-06-29T18:30:15Z")

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This is a diesel car and it is leaking coolant. What part is this? Help it is next to the turbo.

 ![image](https://global.discourse-cdn.com/cartalk/original/3X/4/6/46d5603cac591daacb64c049039b407e547debb9.jpeg)

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**Author:** ![COROLLAGUY1](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/corollaguy1/32/7575_2.png) [@COROLLAGUY1](https://community.cartalk.com/u/COROLLAGUY1)\
**Post date:** [June 29, 2020, 6:54pm UTC](https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562/2 "2020-06-29T18:54:43Z")

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Looks like the coolant temperature sensor to me.

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**Author:** ![Bugmenot](https://avatars.discourse-cdn.com/v4/letter/b/7c8e57/32.png) [@Bugmenot](https://community.cartalk.com/u/Bugmenot)\
**Post date:** [June 29, 2020, 7:08pm UTC](https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562/3 "2020-06-29T19:08:56Z")

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If you are pointing to the thing that looks like an electric motor with coolant hoses attached to one end, it’s an auxiliary [electric] water pump.

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**Author:** ![Honda98](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@Honda98](https://community.cartalk.com/u/Honda98)\
**Post date:** [June 29, 2020, 7:10pm UTC](https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562/4 "2020-06-29T19:10:35Z")

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Yes what the finger is pointing to

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<div class="post-metadata">

**Author:** ![Honda98](https://avatars.discourse-cdn.com/v4/letter/h/e495f1/32.png) [@Honda98](https://community.cartalk.com/u/Honda98)\
**Post date:** [June 29, 2020, 7:10pm UTC](https://community.cartalk.com/t/what-part-is-this-1999-mercedes-benz-diesel/166562/5 "2020-06-29T19:10:45Z")

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Thanks for the answer!