I dont know if that can be repaired or not but what Ican tell you is the PA66 - GF25 tells you that the plastic is polyamide 66 (aka nylon 66) with glass fiber reinforcement at 25 percent its nothing special. If you were to do a repair you would need that same material and a plastic repair iron that can melt it together. You will need to melt the new material into the old material to get a strong bond. With how much a new radiator costs its worth a try even if it fails. Go on youtube and look at videos of plastic radiator repair and even just plastic welding repair videos the basic process will be the same. I believe harbor freight sells a plastic weld kit really cheap. Jb weld may work too but i think welding would be a better repair.