# 2005 Toyota Sienna -HVAC issue

**URL:** <https://community.cartalk.com/t/2005-toyota-sienna-hvac-issue/157762>\
**Category:** Maintenance/Repairs\
**Tags:** toyota\
**Created:** [February 2, 2020, 5:14am UTC](https://community.cartalk.com/t/2005-toyota-sienna-hvac-issue/157762 "2020-02-02T05:14:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BobRoberts](https://avatars.discourse-cdn.com/v4/letter/b/b38774/32.png) [@BobRoberts](https://community.cartalk.com/u/BobRoberts)\
**Post date:** [February 2, 2020, 5:14am UTC](https://community.cartalk.com/t/2005-toyota-sienna-hvac-issue/157762/1 "2020-02-02T05:14:53Z")

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With A/C off,and heat turned on,temperature goes from outsise air to heated air and back.No reason found

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**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\
**Post date:** [February 3, 2020, 1:10am UTC](https://community.cartalk.com/t/2005-toyota-sienna-hvac-issue/157762/2 "2020-02-03T01:10:32Z")

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First step would be to check the coolant level in your radiator and overflow tank and report back.