Just bought a 89 vette. There are three hose nipples on the passenger side of the throttle body. They are pointed at the passenger fender, are located just behind the throttle position sensor. My question is, the bottom goes to the heater core, the middle I think goes to the passenger side valve cover, while I have nothing on the top fitting. What goes there, and is the middle one correct for the valve cover?
Any help will be appreciated. I believe the 88, 89 and 90 are all the same.
Thanks
Al B