By replacing the radiator. I've seen people use JB Plastic Weld and it only holds up for a few weeks.
IF THE LEAK IS FROM THE RADIATOR, THERE IS NO FIX EXCEPT TRY THE RADIATOR STOP LEAK CANS OF FIX....IF THAT DON'T WORK, GET A NEW RADIATOR. THAT'S ALL YOU CAN DO!!!!!!!!!!!
The radiator is more than likely plastic and cannot be repaired ..DO NOT use any of those quick fix things like the radiator repair crud .. just take it like a man and replace the radiator............
Remove the radiator and take it to a radiator shop.
GET RADIATOR STOP LEAK AT THE STORE. $5 IT WORKS UNLESS THE HOLE IS BIG. JOSE
The tanks on the radiator are plastic and the lines vibrate causing the tanks to leak were they screew into the radiator. REPLACE RADIATOR.
If you mean the plastic overflow tank, replace it. If you mean the plastic tanks on either side of the radiator core, replace the radiator.
If it is a small leak, stopgap products like StopLeak can be used, but the radiator will eventually need to be replaced
A leak in a coolant system can usually be fixed by replacing a hose. If the leak is at the end of the hose, a new clamp might be necessary. If the radiator is leaking, the radiator might need to be replaced.
It depends - if the leak is small, just put a bottle of Barr's stop leak in the radiator - make sure you follow the directions. It works great on small leaks.
There is a product that you can buy and add to your radiator called STOP LEAK. Add this product according to the instructions. Be careful, this product can also clog up your radiator if not used properly.
Find the leak source and repair it. Usually the cause is cooler hoses.
broken thermostat; blocked hose to radiator or hole in hose; leak in radiator; etc..