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post #1 of 3 (permalink) Old 05-26-2019, 05:37 PM Thread Starter
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2007 Cobalt cooling system flush questions

Hey fellas,

My son has a 2007 Cobalt LT. He has had an intermittent cooling system error code. Last year I replaced his coolant sensor. The code still comes back. He bought an ACDelco OEM thermostat. Tomorrow I plan on doing a thorough cooling system flush. He has 106,000 miles.


A friend of mine suggested a citric acid flush of the cooling system. Is there any downside of doing this with an Ecotech engine?

Or is there a more thorough way to completely flush and clean out the entire coolant system?

Thanks for any helpful information!
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post #2 of 3 (permalink) Old 05-26-2019, 06:24 PM
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What's the code?

By the way, my 2008 has 221,000 miles and I have never done a coolant flush. I know I need to do it.

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post #3 of 3 (permalink) Old 05-27-2019, 12:13 PM Thread Starter
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I accidentally posted the wrong code (that's another problem). I'm waiting for an answer from him regarding the coolant error code

Last edited by hangman; 05-27-2019 at 12:52 PM.
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