The OE radiator has an aluminum core with a plastic top and bottom that is only crimped to the core. A leak where it is crimped together is common after a while but unlike most other radiators, it can't be repaired well enough to keep it from leaking again in the future. If indeed it's the radiator leaking and not just a bad radiator cap or something else, you're better off replacing the radiator. If you do it yourself, make sure to mix distilled
water with the antifreeze to make your 50:50 mixture. Water from your hose is high in mineral content which will cause calcium (hard water) deposits to start forming inside the radiator which will eventually start clogging it.
So take a good close look once it cools to know for sure if it's the radiator leaking where it is crimped together, a bad radiator cap, or something else.