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Well, it is ideal to use an additional fan controller to have 1 fan running at 18X F, as this is the ideal coolant temperature when engine is running.
The stock e-fan is used in 2 cases - when AC is on and when coolant overheat. So, if you use the stock plug for both fans, your engine will run at a temperature of 200F or higher as there is no clutch fan to cool the coolant in normal condition.
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