vent vacuum

my 91 grand prix only blows air at the feet and windshield. I have heard people talk about 'vacuum' problems. If this is the case, how do i connect the vacuum hose or where is it located? Do i have to take the dash off?:spit:

I don't know where they are at in these cars, but in my Truck it was located in the engine compartment, under the battery. I would advise just buying a haynes book.... it will help you now and in the future

what is up with the double post?