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A serious manufacturing defect. Take it to dealer for repair or you may lose any remaining warranty by abusing the vehicle. If the car is out of the warranty the thermostat may not be opening or stuck, the radiator fan may not be operating, the engine coolant may be low, the head gasket may be bad, the temperature sending unit may be defective and indicating incorrect temperature. Get it repaired by a good mechanic if you are not one yourself.

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Q: What would cause the engine to overheat on a 2008 Chevy Cobalt LS?
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