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The fan switch isn't connected to any black box. In fact, it is a "bolt" that is screwed to the radiator and has 3 electrical pins (I assume that one is always charged and the other two are for low or high speed). I had to replace it when I bought the car because it would get stuck and drain the battery. The circuit also hay a "relay" which is a small metal cylinder clamped to the top of the radiator.
Unfortunately I don't have a temp gauge on the dashboard and therefore have to rely on the warning lights. Although I'm pretty sure it was overheating because the engine compartment was very hot.
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