Disconnect wire to Air Conditioning Compressor and connect normal test light to wire, from engine harness(body)side. Fit new fuse and try air cond controls and switch, test light should light up and hopefully fuse wont blow indicating short in compressor clutch windings(replace compressor). If fuse blows while doing this test compressor might be ok and fault short some where else, fan speed resistor block, fan or control/switches, wiring.
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