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No, only comes on when the coolant is too hot. If the belt/viscous clutch fan is moving enough air (assuming your car has auto transmission), electric fan won't run. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator.
 

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Hey, didn't you say in your other thread that you had gotten this car on the cheap cause of a blown head gasket and that a cooling system overhaul had been performed as part of getting it back to usable condition?

IIRC, the thermostat is one of the basic items to be changed in such an overhaul, so aren't you paying twice for the part?
 
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