I have a part that is broken and I do not know what to call it but I do have a picture to help. I do believe it is apart of the cooling system and is attached to the engine block and it is a black plastic tube. It is 2000 Saturn SC 1.9L DOCH. I am trying to find out if the part is replaceable or I would have to take it to a shop? It's the little black nub in the picture.