does not work. Probably is another vacuum servo. There are 6 or 7 of them under the dash board. Unfortunately, there is only one or two accessible when you remove the glove compartment. For the others, you have to remove the dashboard. A BIG job for you or BIG $$ if somebody else does it for you. Most people replace those servos as they replace the evaporator since they have to remove the dash board anyways.
One thing you can do is check the green? vacuum line(s) entering the firewall from the engine on the drivers side, sometimes they get disconnected.
If you can live with it, just leave it alone. If not, well...good luck!