After you have filled up the coolant, turn on the car with the radiator cap off. Leave the radiator cap off while the car is idleing. You have to wait untill the radiator fan comes on, radiator fluid will drop, add fluid, and watch for air bubbles coming up from the radiator opening at the top. You got to make sure all the air comes out (no more air bubbles) or hot spots will develope in the radiator.