No Vaccum??

I just found another problem, and I'm not sure what to do about it.
Anybody that has a 70's Dart, with a /6, knows about the Vaccum canister under the 2 horns on the Pass. side, right? Well,...Only 2 are hooked up. One goes under the car, and one goes to the Carb. the others are just hanging there. There's no vaccum in the canister! What is the problem?
Thanks ahead for any help.