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Look around the radiator,in one of the end tanks,not the core,you will see a large nut with two wires coming out of it.This is the fan sensor and it switches the fan in and out as required,usually comes on if you have to stop in traffic with a warm engine.Mostly,the temperature is maintained by ram air as you drive along.

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Q: Is the cooling fan in Vauxhall Astra 2002 activated by ECU or something else like for example the fan module?
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