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It may cycle on and off with the AC when coolant temp reaches a certain level, but does not necessarily other wise cycle on and off with the AC. Test by turning on the AC and watch the fan and you will see. The fan does come on with temperature, but I think it would run with temperature regardless of AC. Test by leaving the AC off and blocking the radiator or primary fan so the car begins to get hotter than it normally would and watch the secondary fan.
The real question is does the electric fan help the AC. The answer is that it may under some conditions, but it could be a lot better if there was a direct link regqrdless of coolant temp.
Philip Bradley
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