# Vacuum coolant fill question

**URL:** <https://community.cartalk.com/t/vacuum-coolant-fill-question/160457>\
**Category:** General Discussion\
**Created:** [March 6, 2020, 9:05pm UTC](https://community.cartalk.com/t/vacuum-coolant-fill-question/160457 "2020-03-06T21:05:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Kennedy1963](https://avatars.discourse-cdn.com/v4/letter/k/f17d59/32.png) [@Kennedy1963](https://community.cartalk.com/u/Kennedy1963)\
**Post date:** [March 6, 2020, 9:05pm UTC](https://community.cartalk.com/t/vacuum-coolant-fill-question/160457/1 "2020-03-06T21:05:39Z")

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When you refill a cooling system with a vacuum kit, how does it work if you have the thermostat in place?  
Does it draw the remaining coolant from both sides so to speak?

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [March 6, 2020, 9:09pm UTC](https://community.cartalk.com/t/vacuum-coolant-fill-question/160457/2 "2020-03-06T21:09:30Z")

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Depends if the t-stat has a bleed orifice in it or a bypass around it.

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**Author:** ![Kennedy1963](https://avatars.discourse-cdn.com/v4/letter/k/f17d59/32.png) [@Kennedy1963](https://community.cartalk.com/u/Kennedy1963)\
**Post date:** [March 6, 2020, 9:11pm UTC](https://community.cartalk.com/t/vacuum-coolant-fill-question/160457/3 "2020-03-06T21:11:27Z")

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Ok. Thanks