How do I purge the air from the cooling system of a 98 Ford F150 4.6 liter engine?

To purge air from the cooling system of a 1998 Ford F150 with a 4.6-liter engine, start by ensuring the engine is cool. Remove the radiator cap and fill the radiator with coolant until it reaches the top. Run the engine with the heater on high for about 10-15 minutes, allowing it to reach operating temperature; this helps circulate the coolant and expel air. Keep an eye on the coolant level and top off as necessary until no more bubbles appear, then replace the radiator cap.