Originally Posted by Bdd8591
Could be something as simple as the screw on the squirl cage is loose and not turning the cage. Just an idea. To check just pull the blower motor and see. You will also be able to see if the motor is turning at faster rpm'*. Those plastic cages tend to crack at the shaft of the blower motor.
Um, I've never seen a cracked one myself, and the motor shaft is usually a D-profile so it won't slip; the retainer nut is just that, not a set screw. In any case, it'* not too horrendous to pull the blower motor for a look-see, although the first item I would pull would be the blower speed controller module (or resistor pack, depending on whether you have electronic A/C or not) from the middle of the evaporator core housing on the firewall, just below the MaxiFuse/Relay Center. (Pulling the blower motor and fan will not enable you to see the core fins; you must pull the controller module for that.)
Pulling the blower controller will allow you to see a sizeable area of the evaporator core, and what I suspect you'll find is that its fins are oily and clogged with dirt. Cleaning that will improve the airflow, per the TechInfo article.
Ideally, replacing the evaporator core is the main fix (since it probably sprang a leak, the source of the oily mess), but that requires a lot of disassembly.