I have a 05' equniox with a 3.4l and i water leaking on the back side of the engine. it runs fine, but uses a little water, and the oil looks fine so im pretty sure its not leaking into the cylinder. could it be a blown head gasket that is leaking on the outside of the head? is that even possible? and i noticed that the freeze plug on the passenger side of the head looked like it was leaking, so i replaced it. i think it was part of the problem but it didnt solve it.