AC Vent trouble

The vents on my 94 Mustang GT no longer work. The a/c and heater both work really well, but blow out the defrost vents. What's up with that??? They worked in the morning going to work, but not on the way home in the afternoon. Any suggestions??? :screwy:

I had a similar problem when I forgot to reconnect an AC vacuum line on my car. It worked, but it only went through the defroster. Perhaps you have a bad vacuum line?

The vents on my 94 Mustang GT no longer work. The a/c and heater both work really well, but blow out the defrost vents. What's up with that??? They worked in the morning going to work, but not on the way home in the afternoon. Any suggestions??? :screwy:
in the engine compartment towards the back you will see a vacuum line disconected that will be your problem it happened to me twice

Thanks...that was the problem, except mine actually broke, had to get a new line.