The line you are holding in the pictures runs into a check valve with 2 outlets right behind the battery on the front side of the fender well. At the split, one line runs along side the wires coming out of the fuse block and into the cabin to the heater controls and the other around the nose of the car and to a vacuum reservoir behind the driver's side fog light. At least that how it is on my '97. Since it's newer, yours may only run through a check valve and directly to the heater controls. I modified mine to work in that way since the line that ran around to the reservoir was split and I didn't feel like running fresh line all the way over there.
