Check all the wiring you may have corroded or broken wires, blown fuse. If your box is mounted in engine bay the wires for the relays sometimes gets corroded and you cannot tell by looking at if from the top. What you have to verify if the relays are turning on and off. Listen to it using a a long tube and turn on AC you should hear a click on the relay. If you do then you know its wiring from fan to relays.
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