2002 Mercury Villager has 2 temperature sensors, why?

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phil s

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My Villager has 2 temp sensors, the one I replaced sends the temp reading to the gauge on the instrument panel. I am wondering what the other temp sensors functioin is, does anyone know what its purpose is?. I wanna guess this sensor may send temp to PCM to signal running the cooling fan, does anyone know for sure?
 
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