# 2009 Mercedes c300

**URL:** <https://community.cartalk.com/t/2009-mercedes-c300/166052>\
**Category:** Maintenance/Repairs\
**Tags:** c-class, mercedes-benz, engines\
**Created:** [June 20, 2020, 3:01pm UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052 "2020-06-20T15:01:56Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![TimC300](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@TimC300](https://community.cartalk.com/u/TimC300)\
**Post date:** [June 20, 2020, 3:01pm UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052/1 "2020-06-20T15:01:56Z")

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My car over heard while driving the temperature reaches past 120 into the red if I don’t turn the heater on and then it finnaly cools down to around 90-100 degrees and the only way I would cool down is if the heaters on

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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:** [June 20, 2020, 3:29pm UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052/2 "2020-06-20T15:29:32Z")

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If you keep driving it like this you will surely ruin the engine. Have the car towed to a qualified independent mechanic.

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [June 20, 2020, 4:53pm UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052/3 "2020-06-20T16:53:20Z")

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If you’re very lucky it’s just something simple like a stuck thermostat. But it could be something much worse. Follow @old_mopar_guy 's advice.

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [June 20, 2020, 5:00pm UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052/4 "2020-06-20T17:00:32Z")

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I am assuming that the OP is listing Celsius temperatures.  
If those are Fahrenheit temps, his engine is running _cold_.

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**Author:** ![TimC300](https://avatars.discourse-cdn.com/v4/letter/t/dfb087/32.png) [@TimC300](https://community.cartalk.com/u/TimC300)\
**Post date:** [June 20, 2020, 5:02pm UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052/5 "2020-06-20T17:02:38Z")

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Yes it is it’s in Celsius

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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:** [June 21, 2020, 6:13am UTC](https://community.cartalk.com/t/2009-mercedes-c300/166052/6 "2020-06-21T06:13:06Z")

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Lift the hood and check if the cooling fans are operating. After the engine has cooled, check the coolant level.