Hello all. Can anyone help my ID this part? I have a 2003 F150 SuperCrew FX4 with a 5.4. It has a hose going back into the firewall on the passenger side. I assume to the heater core. This part has a gasket under it that is leaking antifreeze onto the #1 coil pack. Any help would be greatly appreciated. Thanks. Brad

 

The nipple ?I can't tell very well, but it looks like it's leaking by the hose or nipple fitting.

 

Intake manifold crossover tube, requires removing the intake manifold to repair.