ran the line to where? it goes down the pass side fender under the fuse box and into the fat wire harness and into the car, then to a box, that box goes bad, the climate control unit can fail too. some cars have a vac ball in the d/s fender, under the fuse box is a T on some cars, then the other end of the T goes to the vac ball.

the air flow direction is controlled by the vac line. in the dash are two air diaphragm deals that move the linkage, this linkage breaks too.