Andrew's radiator popped in his Camry.
We just put it in last November.
It's not supposed to pop.
In fact, the radiator cap is supposed to relieve pressure before it builds up enough to pop the radiator.
The cap was also put on in November.

I went out there today to look... emergency housecall. I'm not sure yet why it popped. The top tank separated from the core.
He's going to try to bring it by tomorrow for some testing. In the meantime, it seems to be running cool now and not leaking. I carefully pushed the top tank seal back in place, and maneuvered the metal core lip back over the plastic tank to hold it in place. It appears to be holding. Looks fine now.
The radiator has a lifetime warranty, so we'll be replacing it for free. Hopefully it will make it at least long enough to get it here from Durham.
I need to find out why so much pressure built up, and try to make sure it never happens again.