On my 2000 Expedition 5.4 4x4 with 100k miles on it I found a leak....
This is not my picture but its where the leak is comming from....I think....I cant see any leaks when the engine is running I just see a few drops of antifreeze right next to it.
What is this part called?



Thanks...Gage

 

That's where mine is! From my research, you have to completely replace the intake manifold. I called it the coolant crossover tube, but that is exactly where mine was pouring coolant. I found a busted piece of "Composite" intake manifold just under the thermostat, after removing the housing.

 

did you find out what part this was , I have the same problem??

 

That's the water crossover pipe, the gasket may be bad or the plastic intake is cracked. You can't disconnect and inspect until you remove the intake as there are bolts that thread from below.

 

He can disconnect the hose and inspect from the top to see if the base of the fitting is cracked.