7birdslater
Registered User
They are hard plastic lines that go from the back of the intake manifold to to far side of the passengers side firewall by the hinge and go into the car. I can only guess that they do the A/C and heater controls. I have one of them plugged as it had a major leak and im out of that size hose. The vents still switch when I push the buttons and I still hear the standard hiss when pushing them with the car off Where else could this hose go to? something is missing its vacuum. Thanks. Its nasty outside or I would go get a pic.