It is possible that you have not purged the system of air yet. There is an air bleed screw that is made from black plastic. When you fill the system, open the screw and air will escape, start the car and continue to idle the engine until air is purged, then tighten the screw(not too tight, it is plastic) reinstall the radiator cap and allow to run at idle and check for leaks. That should do it.
Monday, November 26th, 2007 AT 2:45 PM