There\'s this tiny lil vac hose on my firewall..what\'s it go to? It starts on the far driverside fenderwell, comes from a thing that looks like a ball to me. I'd say it's a 1/4" hose from there and it goes about halfway across the firewall where it has a T fitting and one of the vac holes of the t is not connected to anything. The other vac hole turns into an even smaller hose that runs into the cab through a grommet. Sorry if this is confusing but does anyone know what this hose is?