Paul, That is the vacuum line that goes into the passenger side of the rear part of the intake manifold to pick up vacuum to run the mode switch for the A/C controls. Inside the pontoon is a vacuum canister, and that is what the line is coming out of. The line is supposed to Tee off for the brake servo vacuum line that is on the rear passenger side of the engine compartment. Hope that helps. Later, Nick Pitello 1852 <A HREF="Http://members.aol.com/njp548">Http://members.aol.com/njp548</A>