1990 Lexus LS400, heater & AC doesn't work but blower works. Any ideas of what I can check or change…

1990 Lexus LS400, heater & AC doesn't work but blower works. Any ideas of what I can check or change out?

check the fuses and relays first, and pray it's not a computer failure which that model is known for when that old. See that a LOT

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