# Air in coolant

**URL:** <https://community.cartalk.com/t/air-in-coolant/62998>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, pickup\
**Created:** [March 26, 2011, 12:08am UTC](https://community.cartalk.com/t/air-in-coolant/62998 "2011-03-26T00:08:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bedrock](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bedrock/32/868_2.png) [@bedrock](https://community.cartalk.com/u/bedrock)\
**Post date:** [March 26, 2011, 12:08am UTC](https://community.cartalk.com/t/air-in-coolant/62998/1 "2011-03-26T00:08:55Z")

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have air trap in coolant after water pump replace.cannot get it out.do i need to drain coolant again and start over.1997 nissan pickup 2.4 liter.

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**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [March 26, 2011, 12:18am UTC](https://community.cartalk.com/t/air-in-coolant/62998/2 "2011-03-26T00:18:11Z")

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No, you don’t need to drain the coolant again, you just have to figure out how to get the air out of the system. Some vehicles have a bleed valve specifically for this purpose. Does your truck have such a valve?

Sometimes you can do it by parking the car facing up a steep hill and allowing the air to escape via the radiator cap.

Sometimes.

Who replaced the water pump?

Do you have a service manual?

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<div class="post-metadata">

**Author:** ![bedrock](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bedrock/32/868_2.png) [@bedrock](https://community.cartalk.com/u/bedrock)\
**Post date:** [March 26, 2011, 12:24am UTC](https://community.cartalk.com/t/air-in-coolant/62998/3 "2011-03-26T00:24:22Z")

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the truck do have a bleed valve.do the truck need to be running or not.when i open the valve.

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<div class="post-metadata">

**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [March 26, 2011, 12:29am UTC](https://community.cartalk.com/t/air-in-coolant/62998/4 "2011-03-26T00:29:12Z")

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That’s why I asked if you had a service manual. A manual would have the correct answer to your question.

I don’t know the correct answer.

I’d try it both ways. What you want is to get the air out of the system. Anything that works, works.

Good luck.