The blower motor is like round cage and the only way to get to it is to take appart the dash. not the insterment cluster but the top and through the glove box is probably the only access. i doubt you will find a schematic just take lots of pictures while taking appart of what each screw looks like as it comes out. most the heater vents are in your way taking them out is not only screws but plastic barbs. just take every thing appart that is plastic and keep track of where it goes the cage you want is dead center of the dash. you dont need to take it out just get access to it. also what ever got there probably fell from one of the vents that blows onto the windshield so the top of dash removal may be easier if all you need is access to pull out some trash.
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The 1992 was prior to Buick putting cabin air filters in so there is not a possibility it is clogged. So more than likely your blower motor is going bad or your fan control switch is bad. Does this problem occur with heating as well as AC? Does it change if you switch between blowing on floor, face, window(defrost) If it doesnt change based on location of blow and type of air temp then I would start by turning fan on high and placing head (ear ) against dash in center of console area. Have someone turn fan knob from low to high with engine OFF...After goign from low to high and back a few times you can see if the blower motor is responding to signal from switch. Listen for a whine, squeal, rattle, or humm. A whine or Humm would indicate a bad blower motor... Squeal or rattle a bad squirrel cage/fan blower blades. If you hear no noise and no perceivable change in blower speed/noise then its possible your switch is bad. Unfortunately the only way to definitely diagnose either is to pull the switch from dash and use multimeter to test for voltage change and for blower motor to pull dash. There is a digital control unit for your car as well. Although rare sometimes the wires on this can loosen or it can go bad. But since you didnt state teh fan wasnt working at all and you are getting cool air, that woudl be teh last thing to check
I think your talking about the heater fan? If you hear more noise as you increase the blower speed, there is something in the squirl cage or a problem with the blower motor itself. Leaves, paper or something lite on the pass side floor, it will get sucked into the recirculation duct,causing a noise.Remove the blower motor and clean out any debris, and inspect the squirl cage and turn the motor by hand to see if you hear any noise
most likely the blower motor squirrel cage hit the fan housing or the motor has a damaged bearing from the impact, the noise is coming from the fan which is on the passenger side, pull the fan assembly out and see if the blower cage is damaged, if it spins true then replace the blower motor, not a very hard job.