Question about 2006 Chevrolet Cobalt

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2006 Radiator Problem

I have a 2006 Chevy Cobalt and have recently been having problems with the Radiator. I had a new radiator and thermostat installed and I seem to be having the same problem which is that the car gets up to 220 degrees F. and then slowly comes back down. Can you help me with this problem?

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  • Anonymous Jul 22, 2008

    Im not sure if this is the same problem but I seem to be hitting 223 F on the highway, but no check engine light comes on.

    Any comments?


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1st what temperature thermostat got installed,also make sure it wasnt put in backwards,if ok start your car let it run when the temperature rise is the fans kicking on to cool the radiator,if they are as soon as they kick on ,with a rag squeeze the top radiator hose,caution it will be hot,you should lose pressure when the fans kick on in the hose it means the thermostat is opening,if ok, check bottom hose to see if you feel antifreeze running thru to let you know its circulating,if not its your waterpump,one thing you can do is when the car is cooled down take off radiator cap and squeeze bottom hose quick 4 times in a row to make sure you dont have an air pocket,if this helps please vote me a fix ya

Posted on Jul 18, 2008

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It is how GM designed the cooling system.
The fans do not come on until high temperature.
I got this info in a email direct from Detroit.
BTW: my 06 Cobalt LS has 260,000 miles on it.
Try turning on the A/C that should force the fan to run and keep the temp down.
Mine only reaches high temps when in traffic; usually runs down the road around 190 degrees.

Posted on Oct 04, 2008

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