Hyundai Repair: Overheating 1998 Hyundai Tiburon, coolant temperature sensor, hyundai tiburon

Question
It seems the seam in the top of the radiator, about 2 inches long, is leaking?  Any suggestions on what I can do, besides replacing of course.
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-----Question-----
My car just started overheating. It only overheats when stopped and idling as long as the car is moving the temp gauge stays down, it is once I come to a stop or slow a lot is when it starts to overheat.
-----Answer-----
First, check you coolant level.  If it's low, check for leaks and fix any that exist.

If, after this, you still have an overheating issue, remove the radiator cap and observe the coolant.  It should start to flow prior to the fans coming on or the coolant boiling out.  If it doesn't, you probably have a stuck thermostat.  This scenario has a low probability since you say it doesn't run hot unless driving slowly.

Once the coolant flows, the fans should eventually begin cycling on and off (prior to the coolant boiling over).  If they don't, you'll need to check the cooling fan circuit for problems.  You could have a blown fuse, a bad fan motor, a bad relay, or a faulty coolant temperature sensor.

Answer
Some radiator shops will repair these, but I don't really recommend that.  It's very difficult to reseal the tank properly without the machinery used in the manufacture of the radiator.  Unfortunately, replacement is probably your best bet for reliable repair.