Here's the recommended procedure;
Open the engine air bleed located on the crossover pipe.
Fill the expansion tank until the coolant flows from the engine air bleed screw and expansion tank is full.Close the engine air bleed screw.
Install the expansion tank cap.
Start the engine and set the heater to 29°C/90°F.Allow the engine to idle for 5 minutes, adding coolant to the expansion tank to maintain the COLD FILL MAX level.
Increase the engine speed to 1500 rpm for between three and five minutes or until the heater is blowing hot air.
Return to idle and verify that heater is blowing hot air.