2007 Cobalt cooling system flush questions
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!