What would cause my cooling fan to come on at 125 according to my scanmaster reading.I have a TT 5.6 chip.It was always coming on at 150 since i built the car and i thought that was normal,but other people say erics chips are set for 166.This car does have a replacement ecm from napa in it since i put it together.Im not sure if it would be an ecm,sensor or wiring problem.