The AC compressor won't engage unless it thinks the blower fan is engaged. The blower fan uses a resistor pack, one resistor per speed setting. You may want to check the fan speed resistors on the bottom of the fan body to make sure they are all functional. There are wiring diagrams in the factory service manuals linked in my signature, they can provide both wire colors and expected resistance values for you to check against.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
