# 2006 Chrysler 300C - Runs hot after thermostat replaced

**URL:** <https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823>\
**Category:** Maintenance/Repairs\
**Tags:** chrysler\
**Created:** [July 11, 2018, 4:02pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823 "2018-07-11T16:02:52Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![tony50](https://avatars.discourse-cdn.com/v4/letter/t/258eb7/32.png) [@tony50](https://community.cartalk.com/u/tony50)\
**Post date:** [July 11, 2018, 4:02pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/1 "2018-07-11T16:02:52Z")

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I changed water pump and thermostat, flushed radiator and still running hot

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**Author:** ![pyrolord314](https://avatars.discourse-cdn.com/v4/letter/p/6a8cbe/32.png) [@pyrolord314](https://community.cartalk.com/u/pyrolord314)\
**Post date:** [July 11, 2018, 4:24pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/2 "2018-07-11T16:24:58Z")

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Did you check the cooling fans to see if they’re engaging?

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**Author:** ![insightful](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/insightful/32/2732_2.png) [@insightful](https://community.cartalk.com/u/insightful)\
**Post date:** [July 11, 2018, 8:06pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/3 "2018-07-11T20:06:02Z")

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Possibly blown head gasket.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [July 11, 2018, 8:57pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/4 "2018-07-11T20:57:49Z")

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Check the color/smell of the transmission fluid.

If the fluid is black and smells burnt, the transmission is running hot causing the engine to run hot.

Tester

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**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\
**Post date:** [July 11, 2018, 11:15pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/5 "2018-07-11T23:15:12Z")

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Are you sure that you put the thermostat in the right way.

If put in backwards it will overheat.

Yosemite

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**Author:** ![tony50](https://avatars.discourse-cdn.com/v4/letter/t/258eb7/32.png) [@tony50](https://community.cartalk.com/u/tony50)\
**Post date:** [July 12, 2018, 4:18pm UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/6 "2018-07-12T16:18:56Z")

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yes they are

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [July 13, 2018, 5:51am UTC](https://community.cartalk.com/t/2006-chrysler-300c-runs-hot-after-thermostat-replaced/120823/7 "2018-07-13T05:51:13Z")

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When refilling the cooling system remove the vent plug in the housing above the water pump, this will allow you to fill the engine with coolant, otherwise you will be refilling the cooling system every 2 miles.