Just wanted to interject that I had an endless coolant leak from this particular seam on an old behr radiator. Had a lot of trouble nailing it down, as it would only leak with the car under load and pressure on the radiator, and as soon as you were idling, it would disappear.

The seam was opening up and closing just enough to create a continuous intermittent problem, so id take extra care with reassembling this properly as it might not by obvious if its leaking later.

In replacing the radiator, I noticed that behr at least has a couple different attachment methods, one is described by GregMN and is basically a flat piece of perforated aluminum thats indented all around the plastic, my leaking radiator was built like that.

I replaced it with a newer behr that was quite a bit more robust and consisted of curled over aluminum hooks in the same spaces. I would not consider that one easy to take apart with that attachment, but it seems a heck of a lot stronger than the bent in tabs.

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