Stock vs VMP tune for hi/lo fan setting

lsp408

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At what temperature does stock vs VMP tune turn on the radiator fan hi/lo for 2012 gt500 with stock thermostat?

I noticed my radiator fan run on lo when the car is still cold. (50f) wasn't sure if that is normal or tune did that. If so, what is the purpose of turning fan on before thermostat open? (Ac only turn on briefly to ensure compressor and fan come on then ac was turn off while fan continue to run)
 

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