Getting ready to slap the ac back in my car, and im running into a couple issues. First off i only have one vacuum line coming out of the firewall, my understanding is there should be 2. I have an 86 iroc 5 speed. This i believe is causing the air to blow out of all the vents, top bottom and front. Also, should the flap stay where it is at when on, as when i shut the car off, and start it again, it takes a sec for the air to come out of the front vent again.