Radiator fluid not getting hot but light going on.

A friend down at work is having a problem with her Dodge Caravan. She's had the water pump, the thermistat, radiator, etc., replaced but the overheating light still goes on. Strange thing is , she says, is
that when she checks the fluid she can stick her finger in the radiator, its not hot at all. Anyone got a notion what could be wrong ?
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Engine size, year of the vehicle, does radiator fan come on?? you need to post more about the problem and the vehicle
Glenn Beasley Chrysler Tech
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