I replaced my radiator last summer and it just started to leak where the house for the overflow tank connects to the radiator. It doesn’t seem to be drawing coolant from the overflow tank and when I am looked in the radiator itself, I couldn’t see fluid, I could see only foam. It had been working fine, not sure what is causing the problem.
Maybe a blocked line? it leaks because it can’t push into the over-flow, and it also cannot draw back any that is there?
Remove the coolant reservior hose from the radiator neck and check and see if the nipple for that hose is cracked.
That was it. A small tear in the hose causing the leak. I just snipped the end off and reconnected and seems to be working great. Thanks for your help.