I just noticed today that i have a similar crack on the top of the radiator tank, when steam started to pour out from underneath my hood. It is a very small leak but i guess i was driving long enough to cause enough pressure to build up that my tiny crack became a gusher. I was about ready to go into a radiator shop to get it looked at today when i saw your post. Just wondering where you would find a plastic welder to fix that? Is it a DIY job, or should i leave it to a professional? Seems to me that that the top of the radiator is just poorly engineered.
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