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You don't always need the fans to cool the coolant. your vehicle's velocity in most cases will provide enough airflow to the rad for it to keep the coolant in its operating temp. your car's thermostat will start to open around 90-95 C (194-203 F) and allow coolant to flow through the rad only when it reaches that temp. The fan logic is controlled by a few different factors, AC operation being one of them. Since the condenser is in front of the radiator you may need more airflow then normal to achieve the same amount of coolant cooling because of the extra AC load.
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