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There are a lot of solders that melt in the 350 degree range and some that melt as low as 200 degrees. I melted the solder out of an older automobile gas tank awhile back. IMO it would be risky.
Like Wise said, make contact with someone that does radiators, even a repair shop should be able to answer your question. But if you think about it, the radiator in a car hits some pretty high temps at times. I don't think you would get hurt, but I would cure at around 350 to be safe. I have a few old style radiators here. I may just stick one in the oven and see how it goes. But I have seen somewhere on Internet where PCing a radiator is offered. Maybe do a Google on it.
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