take the glove box door off. look to the hard left close to the dash, you'll see a round pump with a vac line off the top, and a rod that moves in and out, theres another on the other side, but this one is easy to get too. pull the line off car running see if theres any vacuum when pushing the direction buttons. or if it moves at all. maybe the rod broke that it controls.
that vac line from the pump is said to run to a box in the dash behind everything else i guess. if you pull that lower cover off under the dash pass side, you'll see a bunch of wires come through the fire wall, thats where the vac line comes in the cab. you can look there for it too. it runs to this box im told is back there.
one of these days your gonna want just defroster.
