# Hot/cold

**URL:** <https://community.cartalk.com/t/hot-cold/58825>\
**Category:** Maintenance/Repairs\
**Tags:** parkingbrakes, buick\
**Created:** [December 17, 2010, 7:00am UTC](https://community.cartalk.com/t/hot-cold/58825 "2010-12-17T07:00:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aturne](https://avatars.discourse-cdn.com/v4/letter/a/c67d28/32.png) [@aturne](https://community.cartalk.com/u/aturne)\
**Post date:** [December 17, 2010, 7:00am UTC](https://community.cartalk.com/t/hot-cold/58825/1 "2010-12-17T07:00:24Z")

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what could be the cause of heat blowing hot and cold air off and on? 99 buick pk ave ultra. just had radiator flushed and filled?

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<div class="post-metadata">

**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [December 17, 2010, 10:48am UTC](https://community.cartalk.com/t/hot-cold/58825/2 "2010-12-17T10:48:06Z")

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```
I am not sure exactly what you are describing [i] heat blowing hot and cold air off[/i]

That said, if a heating cooling problem developed right after radiator flush and refill, I would suspect air in the system and whoever did the work likely will correct the problem for you. My next guess would be a vacuum hose that might have been accidentally disconnected during the work. 

Could you tell us the mileage on the car and a more detailed description of the problem?
```