Possibly. If it’s stuck wide open the car will take a long time to warm up and will tend to run cool. My mechanic tells me it’s important to use the factory recommended fuel. An incorrect octane will cause it to run at the wrong temperature. Not sure if it would run hotter or colder though.
Searched for: My 2006 Chevy Cobalt engine code says operating temperature to low does the thermostat control this
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