How to Air purge from cooling system 4.8 vortec?

To air purge the cooling system on a 4.8 Vortec engine, first ensure the radiator is filled with coolant. Start the engine and let it run with the heater set to maximum heat, allowing the thermostat to open. As the engine warms up, monitor the coolant level in the radiator and add coolant as necessary to prevent air pockets. Additionally, you can open the bleeder valves (if equipped) to release trapped air until a steady stream of coolant flows out.