One problem related to gas recirculation valve (egr valve) has been reported for the 2007 Chevrolet Cobalt. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Chevrolet Cobalt based on all problems reported for the 2007 Cobalt.
My daughter was driving home on the highway during rush hour traffic when the temp light came on showing 240 degrees and the fan kicked on and the light went off. The temp light came back on at 304 degrees and the car died while in motion. Without spending alot of money to find specifics, the mechanic is unsure why the cooling system failed currently looking at the possibility of having to replace the engine in its entirety.