after the car has heated up shut if off and feal the the upper and lower rad hoses(be carful not to burn your hand on the exhaust pipes) both hoses should be warm-hot and squeeze them to they should be firm-solid. i once had a air bubble in my system. and are u sure that your car is over heating buy a cheep cooking theromomenter and place it in your coolent tank when you think your car is over heating. the temp sensor is based on resistance. so even thow u have new parts the wires may of broken down and are resisting more giving u a false reading
