I have fixed all the vacuum leaks I can find on the HVAC system and replaced the selector valve. I still seem to have a vacuum leak once everything is connected. I have seperated the headlight system off the HVAC so I can only deal with it at this time. I have individually checked all the lines coming off the back of the selector which all hold vacuum. As soon as I connect the selector switch back up (new switch, old switch fell apart) I can not hold any vacuum out in the engine bay at the connector that T's off to the healight system. If I pull the connector off at the selector switch and plug the black hose I have vacuum. Is my new selector switch bad?