SOURCE: take computer out of car bring inside house connect next day in cold morning car turns on
It would shure help if you had the year end the model of the car on hear,Like it is a little bit hard to belive that your a tech, How much have all vehicles changed in the 18 years that you been a tech.?
fans only operate when the coolant temp exceeds the preset temp setting
the engine runs and warms the coolant and eventually the thermostat opens
coolant flows and in really cold weather the air around the radiator ( especially if moving) will keep the coolant sufficiently cool so that the fans will not activate
The fans may switch on if it is left idling for a period of time as there will be no air flow from a moving vehicle
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