Pontiac Repair: air conditioning, pontiac grand prix, vacuum leak

Question
my air conditioning only blows through the defrost and nothing changes when I turn the knob controlling where it is to come out the vents. is a hose hooked up wrong? this is on a 95 pontiac grand prix

Answer
Hi Doby:

I think this has a vacuum leak going to the heater control head or a bad control head it's self. My guess is a leak going to the control head more so then anything else. If the control head is missing vacuum the air from is defalted to full defrost. So either a vacuum hose came off the engein or is cracked or split. Good luck :)