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I don't know highside from lowside, inside from outside on an a/c system. I have vintage air with dual flexlite fans. Use the trinary switch from v.a as they suggest and have had no probs. My fans come on when my a/c compressor is on as well as temp control when not using a/c. I also have a manuel switch under the dash where I can run fans anytime I want to cool it. Have no Idea if this is right or wrong, it works flawlessly and kinda makes sense to me. (scary huh). My 2¢. Gary