Heater Problem on 1993 Grand Prix
 

Hi,

I've got an Auto 1993 Grand Prix 3.1L V6 and I have a problem with the heater / A/C system.
The car has been off the road with brake problems (see my other post), but I have started the car each week to keep the A/Cworking and the heating/cooling systemair wasblowing ok through the top, centre and feet vents,but I tried it a few months back and the air was only blowing from the vent at the top of the dashboard (Windscreen/Windshield), I have tried all the different heat, vent and speed settings, but it will only blow from this one vent.
How can I fix this?

Thanks,

Darren