I have a 92' 6.5 liter diesel that has leaked water where the line comes in on the coolant crossover above the engine coolant temp. sensor. This morning I tried to loosen the connection to see the leak and it was corroded bad enough the threads broke off and are seized onto where the line screws in.. It had corroded away so much metal that it didnt seal anymore...can you replace the coolant crossover or did I just pull a major oops??