How should you replace antifreeze in your 2009 Chevy Cobalt?

To replace the antifreeze in your 2009 Chevy Cobalt, start by ensuring the engine is cool. Open the radiator cap and drain the old coolant by locating the drain plug at the bottom of the radiator. After draining, close the plug, refill the radiator with a 50/50 mix of new antifreeze and distilled water, and run the engine with the heater on to circulate the coolant. Finally, check for leaks and ensure the coolant level is appropriate in the overflow reservoir.