My dad has a 2002 Explorer that does not move air from the top defrost vents. I thought it was a blend door/actuator issue, but its not. We noticed last night that there is a vacuum pump, accessible through the glove, box with a red (I think) vac line attached to it. There is a thin metal part that connects to a plastic piece, which controls the air flow. My problem is that the plastic portion that connects the two is broken. Is there a fix for this?