air conditioning not comming through the console

There are two movable baffles ('doors') in the typical heater. One is the blend door which moderates the heat temp. The other(s) gates the outlets...they are usually vacuum operated, by a diaphragm actuator mounted on the plenum assembly

Take out the plastic insert from the top if the instrument panel. I don't remember the hose color, but conversion companies often tap into the vacuum system via one of the vacuum lines under the cover. It's not unusual for the tee fitting they use to fail. (Conversion Vans: the #3 reason I hated working on cars for a living. Yeech.)