You need to burp the radiator. When you drained it and refilled the new one, you likely have air bubbles caught behind the thermostat. What you need to do is to jack up the car so that the thermostat is facing forward and is thus raised. Start the car and let it run until it's about 3/4 of the way to overheating (this is how you know the bubbles have circulated around to the thermostat. Then shut the car off and let it cool off. Once it's cooled down enough to open the radiator cap, open it. The pressure drop from opening the cap will allow the thermostat to open and the bubbles will "burp" out of the radiator. Then put the car back on the ground, top off the coolant, adn you're good to go.
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