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Re: A/c wiring 5.3l compressor
If you have an electric fan, you need to run a trinary switch as stated above. The LS ecm will provide a ground to the fan relay to turn on the fan when the engine requires it for cooling and the trinary switch will send a ground to the same fan relay for when the a/c requires it. If you google vintage air trinary switches, they have a useful video that explains how to wire it.
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