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Why does the engine fan of our car never come on?

We have a Peugeot 206 HDi and we have never ever heard the fan cut in Is there a way of checking that the fan does cut in and what temperature should it come on?

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The fan is controlled by a temperature sensor/sender screwed into the water jacket of the engine. You can find it by tracing the electrical cable back from the fan motor to the engine block. Common for the temp sensor/sender to stick and need replacing. Could also be that the cable has come adrift at one end. Or could be that the radiator fan motor has failed. That can be checked by applying current directly to it from the battery.
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