This is fall into exactly I have (93 GXE and recently 2000 GLE). The blower on both of these car is behind the glovebox, you need to unscrew them and take the glovebox out ( more screws in 93 than on 2000 which has only 6). The fan noise is definitly because there's too much dust inside the motor, on
93, you need to unscrew the motor, use 10 mmm socket, drop the motor out, remove the cap, you don't have to take the bobin out, dumpt the dust out then vacumn it if you can, reasemble it, the noise is gone, but I notice when the fan starts to give noise, it won't be long will die, I replaced mine at 297K with aftermarket for less than half price of original one, it works fine but you won't have silky quiet like the original one. On the 2000, I didnot have a chance to remove the motor, I just unplug the flextube used to diverse some cool air back to the motor, then use vacumn cleaner to suck the dirt out, leave the fan runs at lowest speed, this will also help to quiet down, mine is completely quiet again. In the case of 93,to me it not worth money to let the sucker dealer sucks up your money, just for a blower fan. Hope this will help.