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I'm not an A/C tech, but my next step would be to use a jumper wire and make sure the compressor clutch will engage and get you cool air. I'm guessing it will; however, you can't leave it like that. If it does work, then I'd check the fuse with an ohmeter just to be sure (or replace it even). Sometimes fuses look OK, but...
I'd probably next get a voltmeter and check the wire from the ECU and make sure it's sending the right signals out. Do you a have a VOM, the pin-out diagram and voltage levels to test? If you have the VOM I can provide the info if you want to test it yourself.
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