How do you get air out of radiator system on 05 Cadillac CTS 3.6?

To remove air from the radiator system of a 2005 Cadillac CTS 3.6, start by ensuring the engine is cool. Locate the radiator cap and carefully remove it. Run the engine with the heater on high and allow it to reach operating temperature, which will help circulate the coolant. As the temperature rises, check for air bubbles in the coolant reservoir; if necessary, squeeze the upper radiator hose to help purge air, and top off the coolant as needed before replacing the radiator cap.