86 VL calais air con problem

[CuttsCalaisVL]

when i got my '86 VL calais the air con made a very loud noise coming from the actual fan underneath the passenger side dash. i removed the fan and found it had broken blades so i replaced it and now the sound is practically gone. the problem is that when i put the air con on full it makes the usual sound that air con makes when on full but there is hardly any air actually coming out of the vents. is it possible for the air to be getting blocked behind the dash or something/ has anyone had a similar problem?

[jatsvl]

YES, your slide controller is not opening the various hatches to allow the air through (maybe dirty contacts, cable disconnected or vacum lines disconnected) ,or your ducting is dislodged from the vents.