I have this strange vacuum line (I guess) under the hood. It is a grey stiff plastic tube with a black rubber tube on the end and something that looks like a strap. While swapping the wiring harness this weekend I disconnected another grey stiff tube that was connected to a "T" fitting, in-line between the intake manifold and the aux vacuum pump. So as I see it I have two vac lines going into the fire wall at the middle. I guess they both go to the climate system. I reconnected the vac hose to the "T" fitting, but I am still baffled where the other line goes. I know it isn't the boost gauge line or the cruise control line. They go through the firewall on the driver's side of the engine compartment. Any ideas?