My check engine light is on and the fan is kicking on but it doesn't show the coolant temperature, why is the check engine light on?

Asked by Aug 06, 2017 at 04:40 PM about the 2007 Chevrolet Cobalt

Question type: Maintenance & Repair

The check engine light is on. The fan keeps kicking on like it is over heating but  
the temperature of the coolant just shows dashes. the air filter is clean, there is
plenty of coolant, and the radiator is only 3 months old.

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