Help! My 01 Xterra has a hairline crack at the top of the radiator, on the front side 3 inches from the cap. It looks like a paper cut and is oozing coolant. The top of the radiator is a plastic of some sort. Is there a way that this can be fixed or do I need a new part? Looking for a permanent fix, not a band aid job. Anybody know if this part and the radiator are one piece? Thanx