Can't tell you for sure as I no longer have my supra, but I am 95% sure that it is supposed to work when the climate control is set to "High". Also make sure that the climate control is set to a low temperature, like 65 degrees.
Good thing to check is to see if it's just a light issue on the control unit. With the car running, turn your AC on in a setting that you have found it to work. Pop the hood, and look at your AC compressor. You should see that the clutch has engaged, and that the compressor wheel is spinning. Now set the control to "High" and check the compressor wheel again. If it's not spinning, then your AC is malfunctioning in the "High" mode. If it is spinning, then your control unit indicator lights are not working properly.
Hope this helps you out.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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