Well I did take the radiator off and had it boiled out and the flow is good, no roding necessary. It was dirty on the outside of the cores toward the bottom. Very hard to service without taking it all the way out to see just what is in around the cores. At least I now will know my cooling system is in shape for this spring and we will see if that makes any difference this year. "Properly serviced" is an interesting phrase. Makes quit a difference who it's coming from, a guy at a desk or the guy having to make a living cutting grass.