Lots of things can can cause poor output of air. The blower motor bearings can get dry and stiff dragging the blower speed down considerably. The blower regulator can go bad not putting the juice to the blower motor. The pushbutton can get iffy not telling the regulator how much juice to put out. The vacuum system can have all sorts of problems too causing the airflow to not go where it's supposed to, giving the impression of poor blower output. What I'm getting at is that it will require a competent diagnosis to fix properly. There is no replace "x" because that is what usually goes bad. Start by checking the fuses, then check the voltage at the blower motor. Depending on what is found there will determine the course of further repair or diagnosis.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff