How do you fill radiator in 2005 Chevy Cobalt?

To fill the radiator in a 2005 Chevy Cobalt, first ensure the engine is cool, then locate the coolant reservoir and the radiator cap. Remove the radiator cap and, if necessary, the reservoir cap, and pour a 50/50 mix of coolant and water directly into the radiator until it's full. Replace the radiator cap securely, then check the coolant level in the reservoir and add more if needed. Always check for leaks after refilling and run the engine to circulate the coolant, topping off as necessary.