# 2009 Toyota Prius heater is marginal in very cold temps

**URL:** <https://community.cartalk.com/t/2009-toyota-prius-heater-is-marginal-in-very-cold-temps/158512>\
**Category:** Maintenance/Repairs\
**Tags:** prius, toyota\
**Created:** [February 14, 2020, 5:32pm UTC](https://community.cartalk.com/t/2009-toyota-prius-heater-is-marginal-in-very-cold-temps/158512 "2020-02-14T17:32:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![CharlesHersant](https://avatars.discourse-cdn.com/v4/letter/c/e274bd/32.png) [@CharlesHersant](https://community.cartalk.com/u/CharlesHersant)\
**Post date:** [February 14, 2020, 5:32pm UTC](https://community.cartalk.com/t/2009-toyota-prius-heater-is-marginal-in-very-cold-temps/158512/1 "2020-02-14T17:32:20Z")

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heater is marginal in 5 degree weather

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**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\
**Post date:** [February 14, 2020, 11:12pm UTC](https://community.cartalk.com/t/2009-toyota-prius-heater-is-marginal-in-very-cold-temps/158512/2 "2020-02-14T23:12:46Z")

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Is your internal combustion engine coming up to normal temperature? Have you had the cooling system maintained according to your owners manual?  
Of course it could be a malfunctioning blend door.