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i don't know which fan controller you have, i have hayden 3647. And on that unit is a green wire, that green wire is for a/c. What it does is, override the temp sensor. So when you turn on the a/c the fans operate regardless of radiator temp.
Side note: it also operates the fans when, defrost is selected or when selecting high speed on the thermostat.
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LoverTechnologies "Half Broken Things!"
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