Ok guys..I need some help in identifying a vac hose on my 1990 NA. I want to replace it with some yellow silicon hose but don't want to do it before I know what it is. The hose starts down by the battery on the right side and goes along the back firewall and goes into the drivers side fender. I have no idea where it goes after this or where it ends. I figure I could always splice the yellow hose into the black one but I don't want to do it until I am sure what it is or where it ends. Thanks for your help in advance.
