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hi all so i have a mystery coolant leak which i located to be a pipe near the front of the engine, which seemed to be some sort of drain hose, i followed the pipe back to a component located just behind the started motor, but i dont know what the life of me this part is, maybe some sort of coolant expansion valve? here is the part im am looking for the name of.

Thanks in advance.
 

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Looks like the tell tale for the water pump, if coolant or oil gets past the seals it’s designed to leak out of there rather then infect the other system
 

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