is it ok for there to be foam(think froth)in the radiator? and what about bubbles when it is warming up?

Well - the system is under pressure, so when you release pressure (assuming the system is hot), the the coolant will tend to boil. That could be the source of some of your bubbles. Either that, or the system is pulling in air from somewhere, and it's comming up to the radiator. You sure you have all the air bubbles out of your heater core?

 

GD

yes I have all of the air bubbles out of the heater core I get good heat:banghead: