I would generally drain the whole system, including the radiator, then refill with a 50% solution of water and antifreeze. I believe this is the standard procedure for most autos. Fill the engine and the overflow tank. Run the engine till at temperature, then shut down for an hour. By then, the overflow tank will be low if not empty, and need to be refilled. As you use the vehicle, you may need to refill the tank from time to time. as for the amount of AF, hard to tell, just mix a 50-50 solution and add it to the radiator/tank till full, then proceed as noted above. I suggest mixing the solution first, then begin to add.
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