Finishing up a headgasket and EGR delete on a 2003 California LB7. Cant figure out what this hose does, where it goes, what fluid it even is??? Any help would be greatly appreciated so close to getting everything back together. Can provide more pictures if something specific would help. Hose runs underneath harmonic balancer to the passenger side. Has an oring on the end. Possibly blow-by tube? Tried to follow it and it feels like it goes to the positive battery terminal which doesn't make sense.